Abstract: Aiming at the problem that the global navigation satellite system (GNSS) is easily disturbed by the external environment in the process of geological disaster monitoring and the quality of the observation value is low, the partial ambiguity resolution algorithm is realized by selecting the ambiguity subset according to the satellite elevation angle. The fast static mode is used to process the geological disaster monitoring data, and compared with the full ambiguity resolution algorithm, the timeliness, ambiguity resolution rate, Ratio and other aspects of different time resolution are analyzed. The results show that partial ambiguity fixing can effectively improve the fixing rate and the Ratio value. The results of the two fixed strategies are very close in accuracy, and the accuracy in the horizontal direction is better than 5 mm, and the accuracy in the vertical direction is better than 10 mm. Partial ambiguity resolution can effectively improve the availability of GNSS technology in the field of geological disaster monitoring.