Abstract: The paper firstly introduces the importance of ActiveX-technology which is used in network-teaching platform，then researches the design method of ActiveX controls in detail, and sets forth the controls’ design-procedure which based on the algorithm of bubble sort in C language. By using the ActiveX-technology in network-teaching platform, it expands the functions of Web applications, provides the perfect crossplatform for users, therefore, the platform plays an auxiliary role in teaching.

Key words: ActiveX-technology, network-teaching platform, dynamic demonstration, algorithm of bubble sort