Abstract: In order to provide a software workbench for software developer to debug embedded software, a circuits behavior simulation editor is developed. It not only offers circuits schematic design workbench, but also can find the best circuits EHDL description program to get the best simulation circuits. This paper mainly discusses the basic idea of the circuits behavior simulation editor system, including circuits high level simulation model and simulation algorithm,system function module partition, genetic optimization mechanism, etc.. At the same time, it introduces the main implementation technology of the system.