Abstract:A software simulator is designed to resolve a kind of remote monitoring system’s design problem of complex system, large amount of data, changeful data structure, etc. This simulator constitutes a closed-loop debugging system with the internet applications, it’s perforrmans is checked well. The simulator simulates the monitoring object based on XML technology, and integrates forrmating the data frame, generating the software interface automatically, designing user controls, and the other advanced technology, it realizes to set and sent the complex mode data frame automatically. The internet applications problem is found using the simulator, the design idea has the very good application value.