Understanding the relation between multiple agents is very important in developing a multi-atent system. Two concepts, Multi-agent system architecture and multi-agent system architecture prototype are brought forward, and the method of descrbing the relation between agents using the concepts is explored. The sturcture and components are designed. Based on the fact that cooperation between distributed agents is errat-ic, a controlled natural language communication function is designed and realized. Applying the offered inter faces, the user's workload consumed in agent communication and management is reduces, and at the same time, robustness of the multi-agent system is improved.