Abstract: In view of the surface subsidence problem in Henan province, the continuous collection and operation system of Henan province geological information (HNGICS) is used for the first time to analyze the surface deformation in the entire province. In this paper, three-dimensional coordinates under the framework of ITRF2014 of HNGICS datum station with 10-years time baseline are compared to obtain the three-dimensional velocity field in Henan province, and the laws of surface deformation in Henan province are analyzed, which are related to the geological environment.The results show that there is 16 reference stations within 10 mm and 15 stations between 10 mm and 20 mm in Henan province. The overall trend is taken from west to east. The dominant direction of horizontal displacement in the south is 30.70°,and the average velocity is 0.87 mm/a. The prevailing direction of horizontal displacement in the north plain is 82.60°.The rate is 1.6 mm/a and there is noticeable relative movement on the surface of the province. Vertical direction, the average settlement rate in the eastern plain area is 11.0 mm/a, and that in the mountainous area is 1.4 mm/a. The settlement rate in the mountainous area is much lower than that in the plain area.

Key words: HNGICS, surface movement, three-dimensional velocity field, the surface subsidence, groundwater overextraction