The gravity field for testing gravimeters is a standard device to calibrate gravimeters, and it mainly consists of gravity long baseline, gravity short baseline and dynamic calibrate field. The relative gravimeter is usually used to calibrate gravity short baseline and dynamic calibrate field, and also can be used to check equipment of gravity long baseline. Its technical performance must meet the requirements of testing gravity and measurement standards. The paper analyzes the repeatability, stability and uncertainty of CG - 5 relative gravimeters, as well as the consistency of results of multiple devices, and demonstrates the practicability of CG - 5 relative gravimeters to calibrate the value of gravity baseline.