Recenty , the Internet change Human¡¦s life with rapid growth. Especially in recent years , Mainland China have great advancement in Internet. Because environment changes so fast , traditional competitive strategy gas become unavailable. The purpose of this research evaluate the strategy of internet company with dynamics of competitive strategy. This dissertation is divided to five chapters: In chapter 1 , it included introduction of research content¡Bpurpose and motive. In chapter 2 is literature review. It explains administration of virtual community¡Bdynamics of competitive strategy , and the competition on the edge. In chapter 3 , we analysis Internet Content Provider in mainland China , include the administration of ICP and portal site in P.R.C..In chapter 4 , we visited internet companies in Mainland China and then made SWOT analysis for our case. At last , we induce the key successful factor about portal site¡¦s administration in P.R.C. is : 1. Incipient advantage 2. Have no lack of capital 3. The ability to handhold variety market message 4. The free Internet resource 5. A large amount of loyal member 6. Powerful search engine 7. Fast & broad news content 8. The frisky virtual community 9. Brand advantage