BVOCs has great impact on the global carbon budget,chemical reactions in troposphere,formation of ozone,and climate change.The northeast of China is selected as study region,where the forest coverage is high and no research on the emissions of BVOCs has been done yet.The reanalysis data from the National Centers for Environmental Prediction in U.S run in MM5 are used for simulation,with the spatial and temporal resolution of the reanalysis data being 1°×1°and 6 hours.From the simulation results of MM5,the meteorological data in grid are extracted including the temperature,humidity,wind speed and cloud cover fraction,which are necessary for GloBEIS model.Thus the MM5 is integrated with GloBEIS for research of the BVOCs.The vegetation species and distribution data are derived from the latest "Vegetation Information System" database.The simulation period are chosen in July of 2006 and July of 2010,when the high temperature and strong solar radiation brings the flourish of vegetation in the northeast of China.The GloBEIS is run to estimate the emission of BVOCs.The results show that the isoprene emission changes with significant diurnal variation,and is correlated with temperature,PAR and cloud cover fraction.The isoprene emission rises with the increase of temperature and PAR,and reaches maximum value at about 14:00 pm,but it is negatively correlated with cloud cover fraction.While other VOCs are mainly influenced by temperature.This conclusion is consistent with previous studies,so the method of combined MM5 and GloBEIS is feasible and the results are reliable.This research provides effective and reliable means for the forecasting of BVOCs under different scenarios.