Abstract: The recommended calculation method for the anti-overturning stability of gravity retaining walls in the current technical specifications of various engineering industries is problematic. In order to clarify this issue, the resultant moment theorem is a dopted to derive the correct formula for anti-overturning stability calculation. Then, the derived formula and the formula recommended by the specifications are used as examples for calculation, and the calculation results are presented in graphs and tables for comparison. The results show that according to the methods of current technical specifications for calculating the anti-overturning stability of forward inclined, vertical, and small angle backward inclined retaining walls, when the wall height is small, the result tended to be conservative, which could cause waste, and when the wall height is large, the project would fall into a dangerous situation; When calculating large angle backward inclined retaining walls, the project might be in a dangerous situation. Finally, based on this, suggestions for revising the formula of current technical specifications are proposed.