In order to make the user experience good, it is necessary to design a human-computer interface that is more in line with the needs of the project. Through the research on the interface technology of the Qt framework, a beautiful and concise interface is designed and realized. The key mechanisms and core technologies are described, as well as the advantages and disadvantages of other interface tools of Qt. The design method, function realization and infrared image processing application of the system graphical interface are described in in sections. After the system operation test, the design and function have reached the expected requirements, and the user interface has the characteristics of friendly interaction, strong robustness, stable operation and portability. It has fully verified the feasibility and effectiveness of the project implementation. In the future, it is expected to realize data processing through ARM platform underlying drivers, etc., and improve and optimize the handheld observation equipment.