Cannot rotate the foot by moving the knee ( leg_pole.L )
Hit R to rotate
Thats not the problem. I know the commands but there is something weared , happens when i parrent the leg_pole.l now the foot is not rotating with the shin when you move the leg_pole
You don’t rotate poles, they’re just a position in 3D space for a chain to point to. Rotating them doesn’t do anything
How have you parented the bones? Usually with inverse kinematics rigs the pole bone is not supposed to move the foot, but they are meant to move separately. (And forward kinematics don’t need poles. 
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O them it works perfect thanks.
I see, you’re trying to tie foot rotation and knee orientation together. Try doing the opposite : parent the pole to the foot.
Thanks the problem was my mistake I was confused sorry for that