Left is Rendered. Righr is Material Mode
how can i solve this problem?
Hi,
This is normally down to the planes being completely flat in the layer they are on.
You will find if you rotate the planes ever so slightly like in the video then they should stop rendering over each other and being confused.
I believe there is more details to do this in the Q&A against the lecture but i am not at a PC atm so i cant check.
I think its just a slight rotation on the Z axis though that fixes the issues from memory.
so… there is Same Plant plane. so there was two sample has same X.Y.Z ??
Yes thats what i am saying the blades of grass on the other layer that you used to make the plant likely all have a z rotation of 0, a change on some of these to different values will stop blender trying to render the two blades in the same place 
No more than just slightly rotating all of the planes even by a small value should solve it
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