In this paper,the major river system network and drainage basins in the coastal zone of Fujian are extracted based on ASTER GDEM 2 data,and the hypsometric integral (HI) value of the sub-drainage basins is calculated to analyze the response relation between watershed morphology and Neotectonic activities in the area of analysis.Results show the HI value to be distributed in evident bands,where it tends to gradually reduce from the coast to inland in areas divided into Zones Ⅰ,Ⅱ,and Ⅲ,in accordance with features of the NW fracture zone and distributional characteristics of weak earthquakes in this area.In Zone Ⅰ,regions such as Fuzhou and Fu'an have a low HI value because they are costal basins characterized by basinal deposits and partial tectonic descents.The western boundary of Zone Ⅱ is represented by the line of Pucheng-Jianyang-Mingxi-Liancheng,indicating that Zone Ⅱ is basically situated between the Zhenghe-Dapu fault zone on the east side and the Shaowu-Heyuan fault zone on the west side.Observations of vertical modern crust deformation indicate an obvious differential uplift on both sides of the Zhenghe-Dapu fault zone,with a higher uplifting amplitude in the east than the west,which is a reflected by a remarkably higher HI value in Zone Ⅰ than in Zone Ⅱ; this is obviously higher in the transitional landform zone towards the inland than in Zone Ⅲ.Zone Ⅲ is mainly situated in the area west of the Pucheng-Jianyang-Mingxi-Liancheng line,where the HI value has a well-marked low-value anomaly,which may reflect relatively weak tectonic movement in the region and a relatively light influence from coastal tectonic deformation as it is situated far from the coastal zone.The distribution of HI values basically coincides with activity attributes of major NE fault zones in this region,which may be caused by the gradually weakening influence of dynamic antennas on Taiwan Island towards the inland area.In addition,the conflict between expansion of the open rift valley in the South China Sea Basin and the eastward diving process of the Pacific Plate is also fully reflected in the watershed morphology of the coastal zone of Fujian.