Abstract: This paper analyzes the drawbacks of traditional single-frequency preprocessing method,only by analyzing time series,in complex movement and proposes single-frequency preprocessing method based on double differences. The method includes the following aspects:detect epochs of cycle slip based on posteriori standard error of unit weight of double difference,recognize satellites of cycle slip based on residuals of robust estimation and fix cycle slip by back-substitution of cycle slip. Finally,this paper investigates the efficiency of the new method in compound movement of receivers and its capacities to detect continuous cycle slips by simulating kinematic data and analyzing real earthquake data.