The automatic online monitoring system is the development trend of hydrological monitor.In this paper，the system components and working principle of FFZ-01 water surface evaporation station were introduced.The absolute error，agreement rate，F-test，T-test and regression analysis of evaporation data collected by manual and automatic observation from April 1，2019 to August 31，2020 at Pingxiang hydrologic station were analyzed.The results showed that the integrative and automatic monitoring system was an important device with high measuring precision，especially for the rainless days.The agreement rate during the comparative observation period reached 90.6%，and the result in non-flood season was higher than that in flood season.The statistical analysis showed that there were no significant differences in the variance of evaporation data collected by manual and automatic observation.Regression analysis showed that there was a correlation between these two groups of data.The regression equation （y=0.914 2x+0.039 9）reached a significant level，which was effective and reliable.