thank you for respond..the network generate in the same GIS version and PC, i have remove, add network and rebuild network several time, but nothing works..i have try some solution from http://forums.esri.com/Thread.asp?c=93&f=1796&t=138571&g=1 and http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00vs00000004030020.htm but still have the same problem. do i need to attach my mxd project?