In the testing process of infrared products such as seeker,detector and position marker,the high purity and high purity high-pressure gas source is highly dependent on,and the demand for nitrogen is the largest.Moreover,with the development of technology,the demand for nitrogen expands towards the direction of high pressure,high cleanliness,high purity and low dew point.Because the infrared guidance uses 3~5 μm,8~12 μm band detectors,the detector needs to work at a low temperature in the range of 70~100 K(generally 80 K) to obtain sufficient sensitivity,so,cryogenic refrigeration is one of the important conditions for this type of infrared detector.The throttling refrigerator used in infrared guidance technology has high requirements for nitrogen purity,and the purity generally needs to meet 99.999 %.In this paper,a design method of high-pressure nitrogen gas source station for high purity and high purity infrared is briefly described in terms of nitrogen gas source station design,gas purification and drying,gas source station monitoring,plant construction,energy conservation and environmental protection,etc.The design of the source station provides certain significance.