Currently existing studies on the deviation of ultra short baseline hydroacoustic positioning systems mostly concentrate on the static field,while there are few literatures focusing on the dynamic deviation. This paper uses GAPS as the main test equipment to conduct related research on the dynamic deviation of ultra short baseline hydroacoustic positioning systems,proposing a test method for these systems. The circular probability error radius is used for measurement,and the dynamic deviation of GAPS is measured through experiments on the lake,which has provided an important foundation for the study of calibration about underwater positioning systems.