I got informations about using ANM_ADD in my animations!
Now my script looks like this:

....
if(key_w==1)
{
ent_animate(me,"walk",walkvar,ANM_CYCLE);
walkvar+=3;
}

if(key_e==1)
{
ent_animate(me,"push",pushvar,ANM_ADD);
}
...



The problem is the player adds the new Animation Angles to the old one and so the Arms rotate not correctly!
They are now behind the player -.-

Any ideas?