Abstract: The application of electron multiplier in navigation and positioning is seriously restricted by its short lifetime. The fundamental cause is that the gain of the electron multiplier is low and the resistance of the dynode material to bombardment becomes weaker and weaker when operated under high energy ions or strong electron beam conditions. The computational models of secondary electron emission yield proposed by domestic and overseas researchers were analyzed. The advantages and disadvantages of those models were summarized, and some relevant revelations and suggestions were furtherly put forward to establish the computational model of secondary electron emission for the dynode material.