To further understand the relationship between dynamic changes of tropical forest and human activities as well as climate changes,we use methods of time series analysis and correlation analysis to study the temporal and spatial changes of forest net primary productivity(NPP)and their correlation with tree coverage(VCF),temperature,precipitation and photosynthetically active radiation(PAR)in 11 countries in Southeast Asia from 2001 to 2013 based on MODIS remote sensing data and ERA-Interim reanalysis of meteorological data.The main conclusions are as follows:①the NPP in Southeast Asia is increasing from the equator to the north and the south;②NPP in most areas of the study area show a decreasing trend,and regions where have a more dramatic change of NPP usually have a higher coefficient of variation which showsa more unstable carbon sequestration capacity of forest ecosystem;③the tree cover in study areais generally high(60%~80%)and most of thearea have an increasing trend,in addition,the partial correlation coefficient between VCF and NPP was higher than correlation coefficient,indicating that human activities have a greater impacton forest NPP;④the temperature,precipitation and PAR in study area are relatively high,and as for the correlation between NPP and meteorological factors,countries with tropical forest climate have a better correlation than countries with tropical monsoon climate,whose NPP is generally negatively correlated with the temperature and positively correlated with precipitation and PAR.