Bug non-coherent x, y, z axis

Y is the place of Z
and Z is the place of Y ??

like this :

 

This is not a bug. This is how Unity is designed. Unity uses a "left-handed" coordinate system. The system in your diagram is a "right-handed" coordinate system.

 

in 3d space , z is a height.
by default, we see the horizon.
so z should be a height and y an ordinate.

example with rhino3d :

 

This is like trying to tell a British person that a pound is a unit of weight and not a currency. It might be true where you're from, but not here.