A dynamic diagram assessment method for the real-time safety of the center of gravity position of fighter aircraft is proposed. In this method, the axial and vertical components of the real-time center of gravity of the fighter aircraft are utilized to construct the analysis domain, and restrictions of the fighter aircraft's center of gravity at various phases are transformed into geometric constraints. These constraints are introduced to form dynamic safety boundaries of center of gravity. The proposed method can provide real-time reference for the safe center of gravity position of the fighter aircraft. A specific example is provided to demonstrate the rationality and engineering applicability of the proposed method.