In order to realize the accurate identification and determination of the shielding top, the identification and determination methods of the shielding top are described and compared. A calculation example of a certain type of projectile is given, which proves the validity and correctness of the methods of using the lowest geodesic firing angle and based on the whole layer ballistic height, and the suggestions for the use of the two methods are given. The results show that the analysis has reference and practical value for the manual work and software design of shielding top determination.