Thanks a lot. It works like you said. I think it's enough for me now.

Okay, I have sent the project.

Thank you! Now blending works fine.. almost. Now character's hands after blending (idle + hit or move + hit etc.) rotate the wrong angle and never come back to the right rotation. I found the information on this forum that I have to check animation keys in the beginning and in the end of animation. So I checked, rebuild project and resetupped. But effect still stay the same.

I've setupped mecanim in Unity for my character. The main layer includes Idle and walk animation, the second one has only hit animation. The HitLayer (see screenshot) setupped as Additive Blending, but works like Override blending. Transition between idle and move in one layer works fine.