I like to make AOD maps, I’m not able to make perfect circular ground shapes. Is there some hints or editional software to make better circular shapes.

Work out the radius of the circle then choose your height then open height brush chops your settings and place your brush
It should be very close to a circle

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I don't know if this is what you need, but try the mesh mold tool, it makes some cool shapes.
Getting the mesh mold tool to work!  Download by DeeZire.

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I guess you can't that's worldbuilder problem but try this meshmold that i made extract this zip file in C:\Program Files\EA Games\Command & Conquer Generals Zero Hour\Data

then try to use the smoothhight button in worldbuilder toolbar maybe this can solve your problem patience is your bestfriend if you want to build a pretty map.   Editor.zip (43kb) downloaded 6 time(s).

Thnx for all your kind answers, i'll try.
Picture of first trial. It looks worked. I can develop it 😉

your welcome sir 😄