To meet the demand of infrared scene simulation system based on the digital micromirror device,the replacement technology of DMD window is put forward,which can improve the performance of infrared scene simulation system based on DMD.Firstly the capability and applicability of different kinds of infrared material are analyzed.Secondly,the packaging technology that is suitable for DMD is analyzed,the packaging technology of DMD window is more complex than the general packaging technology of window,more influences must be taken into account,such as temperature,press,oxidation and static electricity.Lastly,taking the example of the replacement of the 0.7″XGA DMD window,the performance of DMD is tested and the results of test are given.The testing results show that the technique can meet the demand of the infrared scene simulation system based on DMD.