While performing the marine measuring and controlling mission, aerospace tracking ships need to acquire the ship attitude data in real time for processing, which is the biggest difference between land-fixed station. The aerospace tracking ship is generally in the form of single station measurement, so the selection of target measurement data is single. It can thus be seen that the ship attitude data has a significant impact on the external measurement data processing, and its accuracy directly affects the stability of target tracking measurement and the accuracy of external measuring orbit determination data. This paper comprehensively analyzes the impact of processing flow and method of ship attitude data on the external measuring initial orbit determination of the spacecraft, in the real-time processing of the tracking ship external measurement. According to the actual situation, the corresponding improvement method is proposed, and the measured data of a task is used for post-processing. The validity of the problem and the feasibility of the improved method are verified by the processing results.