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Design pattern is a solution in the structured format describing the problem and solution that can be applied in the new background. Global system for mobile communication (GSM) and general packet radio service (GPRS) are such backgrounds and they all need good MSC simulator software to guarantee the quality of performance test for the system. This paper introduces the method to develop the simulator software using several design patterns for MSC performance test in GSM and GPRS system. The usage of these patterns in the software is also depicted in detail, especially in the aspect of object-oriented design. From this paper, we can see that it is economical to achieve quality software by using design pattern, which makes the MSC performance test more efficient and economical. So, this paper is hopeful to benefit the other systems which needs software development with good quality and efficiency.