Through typical examples, this paper analyses the error types in programming system and studies how to use debugging and testing methods to improve the correctness rate of programs so as to demonstrate that it is not easy to analyze, program and debug a good programming system successfully.

Introducing the error types of VB,the debugging aids and the application of the debugging technology.

The discussion on the error patterns involved in the pronunciation errors, the constraints governing these error patterns and the rank of the constraint hierarchy form the major concern of the present study.

The topic and development of error analysis, together with the definition and inclination of error taxonomy, warrant a complementation to and an integration of current error classification of various sorts.