profitable ea couldn't increase position pls gurus point out method.

[univetsity]

It's great! Now it could run follow my intent.
However,I also found another problem about position cotrol.
You see,like my code it will largen position after profiting,otherwise, the vice.
It could make two bad results:1,after continuous profit, the first lossing order's position would be largest,2,follow continuous loss,the first profiting order's position would be minimum.
sometimes,a profiting order follow continuous lossing orders,then contiunous lossing orders.This cycle might reduce my balance quickly.
Those results seems violate position control's spirit.
Could Gurus share some experience about this? I am appreciating!!

[Enivid]

It's better to base your position size on your total balance (or free margin), not on amounts of your previous losses/wins.
If you want to base your lot size on the most recent trade outcome, you'll have to learn about Z-score and implement its calculation into your EA and then use the resulting data. But it can be quite complex.

[univetsity]

Z-score seems too complex for me,simple strategy is more suitable.
Theoretically speaking, each order is divided,it will not influence the next order and shouldnot be affected by the previous one.so,I am thinking whether modify the lossing strategy or not.