I cannot switch the current animation state to another state immediately.

I am leaning a 2D Parkour game project recently days.I want to change the current animation state to another state when the conditions are satisfied in the game.Now the problem is that the animation state cannot switch to the next state immediately，the current animation state will continue 2 or 3 seconds before current state switch to another state .The code and condition logic are right.I has thought of this problem a few days,but I still cannot solve it now.My edition is 5.2.1.Thanks for your solution.