Abstract: At present, there is an insufficient understanding of the use and maintenance of the land based high-performance inertial navigation equipment domestically. Additionally, there is no accurate theoretical analysis on the effects of improper or non-standard maintenance on the performance of inertial equipment. In order to solve the problem, taking a certain type of land-based high-precision laser gyro positioning and orientation system as the research object, combined with the status quo of domestic inertial sensors, the demand for maintenance of land-based high-precision laser inertial navigation equipment and the importance of standard maintenance operations was analyzed in detail.After electricity maintenance and system calibration at regular intervals, the performance of malfunction equipment was restored.The test data shows that, the horizontal positioning accuracy of the system can be typically improved from 8.35 m(CEP) to 2.9 m(CEP)by maintenance. This paper can provide references and theoretical supports for the design and production of similar equipment in domestic, and utilization for army.