Abstract: The information of Earth gravity field is an important basic data for geophysical research, and is of great significance to China. As a core equipment for land high precision measurement, mobile relative gravimeter’s technical threshold is high, and the domestic market has been monopolized by foreign products for a long time. Based on the core technology of metal zero-length spring preparation, Tianjin Navigation Instrument Research Institute has successfully developed mobile relative gravimeter, which has become one of the few units in China that have mastered this technology and can fully meet the requirements of field measurement operations, including the terrestrial gravity baseline field. Mobile relative gravimeter developed by Tianjin Navigation Instrument Research Institute passed equipment admittance testing of China Earthquake Administration, the most authoritative user organization in China. The measured repeatability standard deviation is 3.1 μGal, the accuracy is 3.5 μGal, the resolution is better than 1 μGal. Its performance reached the international advanced level.