In hydrological emergency monitoring, it is complicated and inefficient to use ordinary leveling to measure elevation. Based on the requirements of hydrological emergency monitoring, the methods of network real-time dynamic （RTK） differential measurement based on AHCORS and quasi-geoid refined model for measuring elevation are preliminarily discussed, and the error statistics are analyzed through the measured data. The results show that the accuracy index of elevation measured by this method is better than the fourth-class leveling, and it meets the requirements of relevant specifications.