压力支撑线

感觉乘风兄的指标不错的，特推荐：

{压力支撑线}
DRAWGBK(C=C,COLORRGB(130,130,130),COLORRGB(30,30,30),1);

var1:=(SMA(HIGH,21,2) * 1.05);
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,9,0),colorFF5B00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,8,0),colorFF6C00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,7,0),colorFF7B00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,6,0),colorFF9C00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,5,0),colorFFBE00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,3.5,0),colorFFCC00;
STICKLINE((OPEN >= CLOSE),CLOSE,OPEN,1.5,0),colorFFFF00;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,9,0),color070084;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,8,0),color0000A3;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,7,0),color0000B7;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,6,0),color0000CD;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,5,0),color0000E9;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,3,0),color0754E9;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,1.5,0),color076EF3;
STICKLINE((CLOSE >= OPEN),CLOSE,OPEN,1,0),color077BF3;
STICKLINE((CLOSE > OPEN),OPEN,LOW,1,0),color0726CA;
STICKLINE((CLOSE > OPEN),CLOSE,HIGH,1,0),color0726CA;
STICKLINE((OPEN > CLOSE),CLOSE,LOW,1,0),colorDE9100;
STICKLINE((OPEN > CLOSE),OPEN,HIGH,1,0),colorDE9100;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),CLOSE,OPEN,9,0),color0090FF;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),CLOSE,OPEN,8,0),color009FFF;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),CLOSE,OPEN,4,0),color00B5FF;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),CLOSE,OPEN,2,0),color00E4FF;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),OPEN,LOW,0.7,0),color00FFFF;
STICKLINE(((((CLOSE / OPEN) > 1.04) AND (CLOSE < var1)) AND ((CLOSE - REF(CLOSE,1)) > 0)),CLOSE,HIGH,0.7,0),color00FFFF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),OPEN,LOW,0.7,0),colorFF76FF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),CLOSE,HIGH,0.7,0),colorFF76FF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),CLOSE,OPEN,9,0),colorFF00FF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),CLOSE,OPEN,6,0),colorFF62FF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),CLOSE,OPEN,4,0),colorFF76FF;
STICKLINE(((((CLOSE < REF(CLOSE,1)) AND (CLOSE < REF(CLOSE,1))) AND (HIGH > var1)) AND (CLOSE < var1)),CLOSE,OPEN,2,0),colorFFA8FF;
/////////
AC:=CLOSE;
转强:=WMA(HIGH,5);
转弱:=WMA(LOW,5);
Bara:=CLOSE*0;
FOR I=13+1 TO DATACOUNT DO BEGIN
IF AC[I]>转强[I-1] THEN
Bara[I]:=1;ELSE
IF AC[I]<转弱[I-1] THEN
Bara[I]:=-1;ELSE
Bara[I]:=Bara[I-1];
END;
转折线:IF(Bara=-1,MA(HIGH,5),MA(LOW,5)),LINETHICK1,colorFFFFFF;
////////////
RSV21:=(CLOSE-LLV(LOW,21))/(HHV(HIGH,21)-LLV(LOW,21))*100;
K21:=SMA(RSV21,5,1),COLORMAGENTA,LINETHICK2;
D21:=SMA(K21,5,1),COLORGREEN,LINETHICK2;
J21:=3*K21-2*D21,COLORYELLOW,LINETHICK2;
m5:=ma(c,5);
m10:=ma(c,10);
zxx1:=CROSS(k21,d21);
zxx2:=CROSS(d21,k21);
zxx3:=CROSS(j21,10);
zxx4:=CROSS(80,j21);
STICKLINE(zxx4,hhV(h,5),hhV(h,5),150,1);
STICKLINE(zxx3,LLV(l,5),LLV(l,5),150,1);
STICKLINE(zxx2,hhV(h,5),hhV(h,5),100,1),LINEDOT;
STICKLINE(zxx1,LLV(l,5),LLV(l,5),100,1),LINEDOT;
DRAWICON(zxx1,l*0.98,10),ALIGN;
DRAWICON(zxx2,h*1.005,11),ALIGN;
DRAWICON(zxx3,l*0.98,4),ALIGN;
DRAWICON(zxx4,h*1.005,5),ALIGN;
//////////
{加仓提示}
VARzc3:=IF((CLOSE>REF(CLOSE,1)),88,0);
VARzc4:=IF(((CLOSE)/(REF(CLOSE,1))>1.10) AND ((HIGH)/(CLOSE)<1.01) AND (VARzc3>0),91,0);
DRAWTEXT((VARzc4>90),(LOW)*(0.94999998),'★加仓'),Color00FFFF;
VARQS2:=ema(ema(l,8),6)*0.799;
土:=VARQS2,Color0080FF;
{下轨道最低价买股指标；很简单的！lDRAWSL(l//////////
bbbb:=MA(LOW,5)*(1-5/100);
振幅均价:=(HHv(bbbb,5)+llv(bbbb,5))/2,colorwhite,linedot;
均线选股:=cross(振幅均价,c) and 振幅均价>ref(振幅均价,1),linethick0;
DRAWTEXT(cross(振幅均价,l) and 振幅均价>ref(振幅均价,1),L*0.998,'▲\n回\n马\n枪'),colorred,ALIGN;
xxs:=MA(LOW,5)*(1-5/100),linedot;
xxs1:=MA(HIGH,5)*(1+5/100),linedot;
均线:=c,linethick2,colorgreen;
aaaa:=close/ref(close,3)<=0.85 and cross(c,xxs) and c>ref(c,1),linethick0 ;
DRAWTEXT(aaaa,L*0.995,'▲\n下\n影\n买'),colorred,ALIGN;
Bbaa:=cross(xxs1,c),linethick0;
DRAWTEXT(cross(xxs1,c),H*1.03,'▼\n开盘逃'),colorwhite,ALIGN;
dddd:=cross(c,xxs1),linethick0;
DRAWTEXT(dddd,h*1.02,'▼\n明日走'),COLORYELLOW,ALIGN;
eeee:=close/ref(close,2)<=0.9 and cross(c,xxs);
DRAWTEXT(eeee,L*0.995,'▲\n抢\n反\n弹'),colorred,ALIGN;
ffff:=REF(C,1)/REF(C,2)<=0.93 AND BETWEEN(C/REF(C,1),1.03,0.97) and close/ref(close,8)<=0.8 and between(ref(c,2)/ref(c,3),1.04,0.96) and between(ref(c,3)/ref(c,4),1.04,0.96),linethick0,coloryellow;
DRAWTEXT(ffff,L*0.995,'▲\n明\n日\n板'),colorred,ALIGN;
VAR1R:=LLV(LOW,2)=LLV(LOW,16) AND CLOSE>=OPEN*1.04;
VAR2R:=CLOSE>(REF(HIGH,1)+REF(LOW,1))/2;
VAR3R:=VAR1R AND VAR2R;
DRAWTEXT(VAR3R,LOW,'▲\n低入 '),colorFFFF,ALIGN;
DRAWTEXT(CROSS((REF(HIGH,1)+REF(LOW,1))/2,MA(CLOSE,20)+2*STD(CLOSE,20)),HIGH*1.02,'▼\n卖出'),COLORWHITE,ALIGN;
///////
A101:=MA(C,10)-MA(C,20),COLORRED,LINETHICK2;
B101:=A101>REF(A101,1) AND REF(A101,1)BL101:= BARSLAST(B101);
M101:=MA(C,10);
D101:= REF(M101,BL101)/HHV(MA(C,10),20+BL101)<0.8;
E101:= A101>REF(A101,1) AND BARSLAST(B101)>2 AND BARSLAST(B101)<12;
F101:= E101 AND D101 AND CROSS(C,MA(C,10));
DRAWTEXT(f101,L*0.995,'★\n均\n线\n走\n平'),COLORYELLOW,ALIGN;
/////////
{预测明日}
C1:=REF(CLOSE,1);
C2:=HHV(C1,2);
C3:=LLV(C1,1);
ET:=HHV(C1,2);
ET1:=REF(ET,1);
XB:=LLV(C1,1);
XB1:=REF(XB,1);
M:=BARSLAST(((CLOSE < XB) AND (C1 >= XB1)));
C1:=REF(CLOSE,1);
C2:=HHV(C1,2);
C3:=LLV(C1,1);
ET:=HHV(C1,2);
ET1:=REF(ET,1);
XB:=LLV(C1,1);
XB1:=REF(XB,1);
M:=BARSLAST(((CLOSE < XB) AND (C1 >= XB1)));
M11:=REF(M,1);
Nn9:=BARSLAST(((CLOSE > ET) AND (C1 <= ET1)));
Nn1:=REF(Nn9,1);
M21:=(BARSLAST((((M - Nn9) > 0) AND (M11 <= Nn1))) + 1);
Nn2:=(BARSLAST((((Nn9 - M) > 0) AND (Nn1 <= M11))) + 1);
ET2:=HHV(ET,M21);
XB2:=LLV(XB,Nn2);
Aab:=IF((((M - Nn9) > 0) AND (M11 <= Nn1)),1,IF((((Nn9 - M) > 0) AND (Nn1 <= M11)),0,2));
H1:=IF(((M - Nn9) > 0),CLOSE,ET2);
H2:=IF((Aab = 1),CLOSE,C2);
H3:=IF(((M - Nn9) < 0),CLOSE,XB2);
H4:=IF((Aab = 1),CLOSE,XB2);
H5:=IF((((M - Nn9) > 0) OR (Aab = 1)),CLOSE,H3);
H6:=REF(H5,1);
H7:=REF(H5,2);
H8:=(H5 > H6);
H9:=(((H4 = REF(H4,1)) AND (REF(H4,1) < REF(H4,2))) AND (H5 > REF(H5,2)));
H10:=(((H2 = REF(H2,1)) AND (H4 = REF(H4,1))) AND (H5 = REF(H5,2)));
W:=((H8 OR H9) OR H10);
T9:=((H5 < H6) AND (H5 < REF(H5,2)));
T10:=((H4 = REF(H4,1)) AND (H5 < REF(H5,2)));
T11:=((H3 > REF(H3,1)) AND (H5 < REF(H5,1)));
T12:=((H5 = REF(H5,1)) AND (H3 = H4));
T13:=((H2 = REF(H2,1)) AND (H2 = H5));
TW:=((((T9 OR T10) OR T11) OR T12) OR T13);
PK:=((AMOUNT * (((OPEN + CLOSE) + HIGH) + LOW)) / 4);
PK1:=IF((VOL > 0),(PK / AMOUNT),((((OPEN + CLOSE) + HIGH) + LOW) / 4));
BBP:=(((CLOSE - LLV(LOW,9)) / (HHV(HIGH,9) - LLV(LOW,9))) * 100);
STICKLINE((ISLASTBAR AND W),(H5 * 1.025),(H5 * 0.99),0.5,0),SHIFT1,colorFF;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,8,0),SHIFT1,color102088;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,7,0),SHIFT1,color102099;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,6,0),SHIFT1,color1020AA;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,5,0),SHIFT1,color1020BB;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,4,0),SHIFT1,color1020CC;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,3,0),SHIFT1,color1020DD;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,2,0),SHIFT1,color1020EE;
STICKLINE((ISLASTBAR AND W),(H5 * 1.02),H5,1,0),SHIFT1,color1020FF;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.96),((H5 + H3) / 2.05),0.5,0),SHIFT1,colorFF8800;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),8,0),SHIFT1,colorFF7700;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),7,0),SHIFT1,colorFF8800;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),6,0),SHIFT1,colorFF9900;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),5,0),SHIFT1,colorFFAA00;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),4,0),SHIFT1,colorFFBB00;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),3,0),SHIFT1,colorFFCC00;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),2,0),SHIFT1,colorFFDD00;
STICKLINE((ISLASTBAR AND TW),((H5 + H4) / 1.99),((H5 + H3) / 2.03),1,0),SHIFT1,colorFFEE00;
DRAWTEXT((ISLASTBAR AND (BBP >= 96.5)),(H5 * 1.022),'     明见\n     短高\n     龙头\n     除外'),SHIFT1,colorFFFF;
DRAWTEXT((ISLASTBAR AND (BBP < 1)),((H5 + H4) / 1.96),'    明见\n    短低\n    跌停\n    除外'),SHIFT1,colorFF00FF;
DRAWTEXT(((ISLASTBAR AND W) AND (BBP < 96.5)),(H5 * 1.022),'    明日\n    看涨'),SHIFT1,COLORMAGENTA;
DRAWTEXT(((ISLASTBAR AND TW) AND (BBP > 1)),((H5 + H4) / 2),'     明日\n     看跌'),SHIFT1,COLORGREEN;
////////////
DRAWTEXTex(1,0,10,5,'■所属板块：'+BlKNAME),Color00FF00;
DRAWTEXTex(1,0,10,20,'╬'+STKLABEL+'【 '+STKNAME+' 】'),LINETHICK1,ColorFFFFFC;
RH:=H-L;
R:=DYNAINFO(14)*100;
DRAWTEXTEX(1,0,10,45,'日高低差:'+NUMTOSTR(RH,2)+'元'),COLORWHITE;
金叉:=barslast(FILTER(CROSS("KD.K","KD.D") and "KD.D"<30,13));
主力吸筹区:=if(金叉>0 and 金叉<61,金叉,0);
DRAWTEXTex(1,0,10,60,'主力建仓天数：'+NUMTOSTR(主力吸筹区,0)+'天'),ColorFFFFFC,LINETHICK1;

MA30:=EMA(CLOSE,30);
MA60:=EMA(CLOSE,60);
MA125:=EMA(CLOSE,125);
MA250:=EMA(CLOSE,250);
A1:=MA30[SYSPARAM(1)];
RA1:=MA30[SYSPARAM(1)-1];
jt1:=IF(A1>RA1,'↑','↓');
DRAWTEXTEX(1,0,10,110,'MA30: '+NUMTOSTR(MA30[SYSPARAM(1)],2)+jt1),COLORWHITE;
A2:=MA60[SYSPARAM(1)];
RA2:=MA60[SYSPARAM(1)-1];
jt2:=IF(A2>RA2,'↑','↓');
DRAWTEXTEX(1,0,10,130,'MA60: '+NUMTOSTR(MA60[SYSPARAM(1)],2)+jt2),COLORWHITE;
A3:=MA125[SYSPARAM(1)];
RA3:=MA125[SYSPARAM(1)-1];
jt3:=IF(A3>RA3,'↑','↓');
DRAWTEXTEX(1,0,10,150,'MA125:'+NUMTOSTR(MA125[SYSPARAM(1)],2)+jt3),COLORWHITE;
A4:=MA250[SYSPARAM(1)];
RA4:=MA250[SYSPARAM(1)-1];
jt4:=IF(A4>RA4,'↑','↓');
DRAWTEXTEX(1,0,10,170,'MA250:'+NUMTOSTR(MA250[SYSPARAM(1)],2)+jt4),COLORWHITE;

{换手100%}
svol:=INTPART(SUM(V,0)/CAPITAL);
tj0:=svol>REF(svol,1) or BARSSINCE(CLOSE)=0;
S1:=BARSLAST(tj0)+1,PRECISION,COLORWHITE;//时间1
tj2:=S1S2:=if(tj2,ref(S1,1)+1,S1),PRECISION,COLORMAGENTA;//时间2
S3:=sum(tj2,0),COLORMAGENTA;
阶段总额（万元）:=SUM(AMOUNT/10000,S2)*100,PRECISION,LINETHICK,Color008BFA;//换手100%成交额
阶段总量（手）:=SUM(V,S2)*100,PRECISION,LINETHICK,COLORCYAN;//换手100%成交量
阶段成本（元）:=(阶段总额（万元）/(阶段总量（手）/100)),LINETHICK,PRECISION2,COLORRED;
DRAWTEXTex(1,0,10,75,'阶段平均成本:'+NUMTOSTR(阶段成本（元）[SYSPARAM(1)],2)+'(元)'),align4,COLORCYAN;
Aa3:=SUMBARS(VOL,CAPITAL);
换手成本:=IF(CAPITAL>0,SUM(AMOUNT,Aa3)/SUM(VOL,Aa3)/100,EMA(CLOSE,120));{100%换手平均成本线};  
DRAWTEXTEX(1,0,10,90,'换手成本:'+NUMTOSTR(换手成本,2)),COLORYELLOW;

BB:=BARPOS=SYSPARAM(1);
variable:wday[7]='星期六';
wday[1]:='星期日';
wday[2]:='星期一';
wday[3]:='星期二';
wday[4]:='星期三';
wday[5]:='星期四';
wday[6]:='星期五';
fy:=YEAR;
fm:=MONTH;
fd:=DAY;
wd:=WEEKDAY;
pd:=SYSPARAM(1);
DRAWTEXTEX(c,1,0,840,'■今日： '+NUMTOSTR(fy[pd],0)+'年'+NUMTOSTR(fm[pd],0)+'月'+NUMTOSTR(fd[pd],0)+'日 '+wday[wd[pd]+1]),COLORYELLOW;

yyzq:=(sysparam(3)-sysparam(2))/1.8;
picl:=refx(llv(sysparam(5),yyzq),yyzq);
当天换手率:=((VOL / CAPITAL) * 100);
b:=DATACOUNT-BARPOS+1;
Wb:=BARSLAST(SYSPARAM(1)=BARPOS)+1;
换手率1:=SUM(当天换手率,Wb);
累计换手:=REFX(换手率1,Wb[DATACOUNT]-1);
DRAWTEXT(SYSPARAM(1)=BARPOS,picl,NUMTOSTR(b[SYSPARAM(1)],0)+'天'+'换手: '+NUMTOSTR(累计换手[SYSPARAM(1)],2)+'% '),align2,COLORYELLOW;
VERTLINE(SYSPARAM(1)=BARPOS),LINEDOT,COLORGREEN;
VERTLINE(SYSPARAM(3)=BARPOS and b),LINEDOT,COLORRED;

sj:=datacount-sysparam(1);
涨跌:=(DYNAINFO(7)-C)/C*100,COLORYELLOW,LINETHICK0;
{drawnumber(barpos+4=sysparam(1),l,sj,0),align5,COLORWHITE;//交易日}
DRAWTEXTex(1,0,10,250,'距今涨跌:'+NUMTOSTR(涨跌[SYSPARAM(1)],2)+'%'),align4,COLORRED;



hh:=SYSPARAM(4);ll:=SYSPARAM(5);
x:=ll-(hh-ll+MINDIFF)/5;
y:=HHV(VOL,SYSPARAM(3)-SYSPARAM(2)+1);
yvb:=y[SYSPARAM(3)]/(ll-x+MINDIFF);
z:=VOL/yvb+x;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,9,0) ,colorAA;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,8,0) ,color11BB;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,7,0) ,color22CC;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,6,0) ,color33DD;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,5,0) ,color44EE;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,4,0) ,color55FF;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,2.2,0) ,color66FF;
STICKLINE(CLOSE>REF(CLOSE,1),x,z,1.5,0) ,color77FF;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,9,0),colorAA00;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,8,0),colorBB11;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,7,0),colorCC22;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,6,0),colorDD33;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,5,0),colorEE44;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,4,0),colorFF55;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,2.5,0),colorFF66;
STICKLINE(CLOSE<=REF(CLOSE,1),x,z,1.5,0),colorFF77;

HLC:=REF(MA((HIGH+LOW+CLOSE)/3,N),1);
HV:=EMA(HHV(HIGH,N),3);
LV:=EMA(LLV(LOW,N),3);

1.支撑线和压力线的含义。支撑线又称为抵抗线，是指当股价下跌到某个价位附近时，会出现买方增加、卖方减少的情况，从而使股价停止下跌，甚至有可能回升。支撑线起阻止股价继续下跌的作用。这个起着阻止股价继续下跌的价格就是支撑线所在的位置。

压力线又称为阻力线，是指当股价上涨到某价位附近时，会出现卖方增加、买方减少的情况，股价会停止上涨，甚至回落。压力线起阻止股价继续上升的作用。这个起着阻止股价继续上升的价位就是压力线所在的位置。    在某一价位附近之所以形成对股价运动的支撑和压力，主要由投资者的筹码分布、持有成本以及投资者的心理因素所决定。当股价下跌到投资者(特别是机构投资者)的持仓成本价位附近，或股价从较高的价位下跌一定程度(如50%)，或股价下跌到过去的最低价位区域时，都会导致买方大量增加买盘，使股价在该价位站稳，从而对股价形成支撑。当股价上升到某一历史成交密集区，或当股价从较低的价位上升一定程度，或上升到过去的最高价位区域时，会导致大量解套盘和获利盘的抛出，从而对股价的进一步上升形成压力。

2.支撑线和压力线的作用。如前所述，支撑线和压力线的作用是阻止或暂时阻止股价朝一个方向继续运动。我们知道股价的变动是有趋势的，要维持这种趋势，保持原来的变动方向，就必须冲破阻止其继续向前的障碍。比如说，要维持下跌行情，就必须突破支撑线的阻力和干扰，创造出新的低点；要维持上升行情，就必须突破上升压力线的阻力和干扰，创造出新的高点。由此可见，支撑线和压力线有被突破的可能，它们不足以长久地阻止股价保持原来的变动方向，只不过是暂时停顿而已(图6—8)。

同时，支撑线和压力线又有彻底阻止股价按原方向变动的可能。当一个趋势终结了，它就不可能创出新的低价或新的高价，这时的支撑线和压力线就显得异常重要。

在上升趋势中，如果下一次未创新高，即未突破压力线，这个上升趋势就已经处在很关键的位置了，如果往后的股价又向下突破了这个上升趋势的支撑线，这就产生了一个很强烈的趋势有变的警告信号。这通常意味着这一轮上升趋势已经结束，下一步的走向是下跌。

同样，在下降趋势中，如果下一次未创新低，即未突破支撑线，这个下降趋势就已经处于很关键的位置；如果下一步股价向上突破了这次下降趋势的压力线，这就发出了这个下降趋势将要结束的强烈信号，股价的下一步将是上升的趋势(图6—9)。

3.支撑线和压力线的相互转化。支撑线和压力线之所以能起支撑和压力作用，两者之间之所以能相互转化，很大程度上是由于心理因素方面的原因，这也是支撑线和压力线理论上的依据。

证券市场中主要有三种人：多头、空头和旁观者。旁观者又可分为持股者和持币者。假设股价在一个区域停留了一段时间后突破压力区域开始向上移动，在此区域买人股票的多头们肯定认为自己对了，并对自己没有多买人些股票而感到后悔。在该区域卖出股票的空头们这时也认识到自己弄错了，他们希望股价再跌回他们卖出的区域时，将他们原来卖出的股票补回来。而旁观者中的持股者的心情和多头相似，持币者的心情同空头相似。无论是这四种人中的哪一种，都有买入股票成为多头的愿望。这样，原来的压力线就转化为支撑线。

正是由于这四种人决定要在下一个买人的时机买入，所以股价稍一回落就会受到大家的关心，他们会或早或晚地进入股市买人股票，这就使价格根本还未下降到原来的位置，上述四个新的买进大军自然又会把价格推上去，使该区域成为支撑区。在该支撑区发生的交易越多，就说明很多的股票投资者在这个支撑区有切身利益，这个支撑区就越重要。

以上的分析过程对于压力线也同样适用，只不过结论正好相反。

可见，一条支撑线如果被跌破，那么这一支撑线将成为压力线；同理，一条压力线被突破，这个压力线将成为支撑线。这说明支撑线和压力线的地位不是一成不变的，而是可以改变的，条件是它被有效的、足够强大的股价变动突破(图6—10)。

4.支撑线和压力线的确认和修正。如前所述，每一条支撑线和压力线的确认都是人为进行的，主要是根据股价变动所画出的图表，这里面有很大的人为因素。

一般来说，一条支撑线或压力线对当前影响的重要性有三个方面的考虑：一是股价在这个区域停留时间的长短；二是股价在这个区域伴随的成交量大小；三是这个支撑区域或压力区域发生的时问距离当前这个时期的远近。很显然，股价停留的时间越长、伴随的成交量越大、离现在越近，则这个支撑或压力区域对当前的影响就越大；反之就越小。

上述三个方面是确认一条支撑线或压力线的重要识别手段。有时，由于股价的变动，会发现原来确认的支撑线或压力线可能不真正具有支撑或压力的作用，比如说不完全符合上面所述的三个条件，这时，就有一个对支撑线和压力线进行调整的问题，这就是支撑线和压力线的修正。

对支撑线和压力线的修正过程其实是对现有各个支撑线和压力线重要性的确认。

每条支撑线和压力线在人们心目中的地位是不同的。股价到了这个区域，投资者心里清楚，它很有可能被突破；而到了另一个区域，投资者心里明白，它就不容易被突破。这为进行买卖提供了一些依据，不至于仅凭直觉进行买卖决策。