Please help me ! I have problem with my brush height..

The problem is that brush is not a CIRCLE !!! Why?

Can you tell me how i set brush in a Circle, not square !? :ashamed:

Here is a pic. Zoom in please.
  

Looks cricular to me... What do you mean?

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The maximum circular brush size is a 100 or 1000 feet. For example, if you have a feather width set at say 4 then the max brush size to maintain a circle would be 92 because you're taking 4 off of each side. Anything larger starts to get cut off into the shape of a square.

On the small side you need to remember that the map is made out of squares and you are raising these squares with this tool. You can use the Smooth Height tool to blend your edges but you will never be able to make round column with the height tool.