The player does not walk according to the floor

I am not really sure what you are asking, as you're English seems to be not your native language, so I am gonna take a guess and just say, try adding to your script that the player's transform or the rigidbody of the player is "pushed" downwards (Or along the y axis) towards the ground by Time.deltaTime until it collides with the floor. This has worked for me in the past. Or even perhaps checking to see if the Character Controller or Collider is just larger than the graphic of the character himself. If it is an imported Asset you may have to resize the collider box. Try watching a YouTube.Com Character movement Tutorial.