At last, this paper provides the mend method of Discrete Vector Model, so that the system can enhance simulation precision in base of high real time, and has more perfect simulative performance.

SP is a portable, strongly-typed, event-oriented, discrete system simulation language, It is derived from PASCAL by adding some simulation functions.

This Paper develops a two-level hierarchical algorithm for discrete event dynamic system simulation based on decomposition coordination Principle for large scale systems.