On　the　one　hand,　in　network　economy　era,　the　traditional　economic　growth　theory　cannot　explain　the　benefits　of　enterprise　informationization　well.　Every　customer　could　easily　enter　the　network　because　of　the　quite　low　costs,　and　then　the　increasing　customers　will　push　the　entire　network　to　be　an　exponential　growth,　so　information　technology　plays　a　positive　feedback　effect　on　the　network　system.　On　the　other　hand,　based　on　system　dynamics　to　analysis　what　the　network　effects　will　go　on　about　e-commerce,　finds　out　the　relationship　between　the　number　of　e-commerce　network　and　e-commerce＇s　value.　Therefore,　the　article　analyses　the　enterprise　how　to　implement　ecommerce　in　order　to　come　about　network　effects　and　then　to　make　a　great　network　value,　thereby　avoiding　unsuccessful　situation　on　e-commerce.　©　2008　IEEE.