Is there anyway to control the min and max in the standart softimage depth channel ?

For the depth channel I think this is not possible.
You'd have to create a depth pass with a "Fog" shader instead of the standard "Constant Density" Shader...

this might be usefull

http://caffeineabuse.blogspot.com/2009/01/custom-depth-pass-in-xsi.html

I don't have any problem with depth pass , my problem is in depth channel and it's seems a limitation in softimage .
Many thanks .