Abstract: With the development of space exploration technology, the analysis of soil composition on the surface of stars such as Mars and the Moon and the exploration of living matter have become important targets of space exploration in the future. The use of miniaturized mass spectrometers to detect the surface of the outer planet and the composition of the subsurface material in situ is one of the important research methods. In particular, NASA and ESA have begun research and space applications of ion trap mass spectrometry in recent years. With the rapid advancement of deep space exploration activities and space science experiments in China, there is an urgent need for the development of miniaturized, low-quality, low-power ion trap mass spectrometry. The basic principles and related parameters of the linear ion trap are designed. The preliminary simulation and verification are carried out by using SIMION software. The results show that the miniaturized linear ion trap can meet the basic mass spectrometry requirements. It provides the necessary design basis for the development of linear ion trap for space exploration.