Abstract: With the rapid development of the internet technology, the internet technology plays a more and more important role in people's daily life. The mobile Internet security problem is more and more prominent because of the integration of the mobile Internet and Internet. The network protocol, which is the core of the framework of the internet communication is widely attention nowadays. Network protocol analysis system can eliminate the network faults and optimize network in order to improve the security of the internet. In view of the research significance and the practical value of the network protocols, the network protocol are analyzed in detail in this paper. This paper first briefly introduces the common analysis platforms of the network protocol and then introduces the WinPcap technique. This paper has designed the analysis system of the network protocol by using of the powerful programming functions of the WinPcap technique, and the two modules of the analysis system of the network protocol has carried on the detailed design and implementation. In Android mobile phone access to the internet, for example, it can cycle to capture packets and analyze the typical network protocols. Experimental results show that the system can provide a basic tool to solve the problems of network security of mobile intelligent terminals.