Abstract: In the circuit model of interconnection transmission line for MultiChip Modules，it is necessary to take into account the effects of both line inductance and line resistance．The analysis of MCMs is more comprehensive than that of traditional PCBs and ICs．This paper provides a new method to study on the delay in tree-structured MCM Interconnection Networks．Firstly，it demonstrates the properties of delay in MCM circuit．Secondly，It investigates the expressions of the first several moments of tree-structured interconnection networks．Lastly，from the close relation between the moments and delay，an actual approach is presented．