Based on the meteorological observation data of surface and solar radiation from 2001 to 2002 in Mohe, Heilongjiang Province, using the BATS1E model with 6h time step, the BATS land surface process was coupled with vegetation growth process. The relationship between the growth of the deciduous needle-leaf forest in cold-temperate zone and the climatic factors is analyzed. The results show that the relation for various time scales is different. The diurnal variation of NPP has closer relationship with the solar radiation and the daily NPP has some negative correlation with precipitation. The monthly NPP has apparently active correlation with monthly average air temperature.