In flight test, due to the continuous attitude change of the target to be measured and controlled, the direction of the communication antenna will also change, resulting in the change of the intensity of the received signal of the ground TT&C station, which will affect the operating range of the target. Since the accurate antenna pattern is not easy to obtain, only antenna beam width and main lobe gain can be obtained in general. Therefore, it is necessary to fit the approximate gain of each direction of the main lobe according to the finite parameters. In this paper, a telemetry range analysis method based on target attitude is designed. Using the existing target antenna parameters, the intersection angle gain of the antenna main lobe is obtained by coordinate transformation and quadratic polynomial fitting. Combined with real-time attitude data, it is accurately determined whether the measurement and control link can be established between the target and the ground station effectively.