[Objective] Vegetation productivity changes due to changes in heat, water, air and other factors, so it is necessary to explore the change law of vegetation productivity and its response to climate factors. [Methods] Based on GEE (Google Earth Engine), the vegetation productivity (NPP) of Tianjin during 2001-2022 was calculated, and the spatial and temporal variation pattern of NPP was analyzed by Slope trend analysis, F-test, barycentric migration model, standard deviation ellipse model and other methods. Multi-factor sensitivity analysis and correlation coefficient evaluation were used to quantitatively evaluate the NPP response characteristics under temperature, precipitation and wind speed changes. [Results] The results showed that: (1) The average annual vegetation productivity in Tianjin showed an increasing trend of fluctuation, and the fluctuation range was 53.46~96.54 g Cm-2a-1; (2) The vegetation productivity of Tianjin is higher in the north and lower in the south, and higher in the west and lower in the east. The center of gravity is concentrated in the central region, and the center of gravity gradually moves to the south during 2001-2022. (3) The response of vegetation productivity to climate factors in Tianjin has a significant lag time, with a lag time of 1 month for temperature and precipitation and 3 months for wind speed. [Conclusion] This study analyzed the spatio-temporal variation pattern of NPP in Tianjin, identified the relationship between vegetation productivity and climate factors, quantified the lag time of response to climate factors, and provided a research example for evaluating the impact of different climate conditions on vegetation productivity.