Abstract: Based on the analysis of the current radar system error calibration method, the multi-sea area measured data is used to systematically analyze the distribution characteristics of radar system error at sea. Firstly, the radar and auto indertification system (AIS) information are used to obtain the systematic error sequence required for error analysis. On this basis, the K-S test, distribution fitting and variable fitting method are used to analyze the numerical distribution characteristics, correlation characteristics and regional distribution characteristics of the systematic error. The work done has important practical guiding significance for the accurate implementation of radar system error calibration.