Aiming at the development trend of long range and large shooting height of conventional rocket, theoretical derivation and simulation were adopted to analyze and point out the deficiencies of our artillery standard earth terrain and meteorological conditions. The plane and parallel gravity fields were revised to be normal sphere and central gravity field, and the upper limit of standard meteorological height was extended from 31 km to 86 km to form new standard firing conditions. It provided reference for the trajectory calculation, performance evaluation, firing table compilation and academic research and communication of the weapon system with medium range and large shooting height.