Nowadays,the electronics devices are developing towards high speed,wide band,high sensitivity,miniaturized size and high density.The requirement for stability and robust of the devices becomes more and more important.The EMC design is a crucial aspect in the system design,especially in military products.Taking into account the EMC in the first phase of system design,most of the EMC problems will be eliminates and the integrating and test of the whole system will be easy.This paper focuses on the filtering and shielding methods of Sterling crycooler.Practical application shows that the EMC optimized Sterling crycooler can meet the requirement of the standard of GJB151A-97.