The gross primary production (GPP) of northern China in 2008 was modeled by integrating MODIS data and flux measurements to analyze its spatial distribution and seasonality. The GPP in this region is higher in the east and lower in the west in general. In 2008, the mean annual GPP was 518.36 g/m2 (weight of carbon, the same bellow). The GPP of most vegetation types in northern China shows a single peak in seasonal curves. These vegetation types can be arranged in the values of GPP as follows: deciduous broadleaf forest (DBF)> mixed forests (MF)> croplands (Crop)> deciduous needleleaf forest (DNF)> evergreen needleleaf forest (ENF)> grasslands (Grass)> open shrublands (Oshrub)> barren or sparsely vegetated (BSV). The seasonality of GPP can be summarized as: the GPP reaches the highest value of 32.80 g?m-2?(8 d)-1 in summer, drops to 5.67 g?m-2?(8 d)-1 and 5.08 g?m-2?(8 d)-1 for spring and autumn respectively, and had the lowest value of 0.07 g?m-2?(8 d)-1 in wintertime. The VPM-simulated GPP in this paper was close to the observed GPP at flux stations. The absolute values of relative errors are mainly less than 15%. This demonstrates advantage of integrating remote sensing and flux measurements to study the spatial and temporal characters of GPP at regional scale, and it has great potential for investigating the interaction between land and atmosphere in the region.