Abstract: Based on the grid systemic sampling method and the biomass models, the distribution patterns of broadleaved forest biomass in Guangdong were studied. The results showed that the average biomass of Guangdong broadleaved forest is relatively low, only 76. 82 t/hm^2 ; Biomass was unevenly distributed on different economic regions and different drainage area. The biomass showed similar trend with latitudinal and altitudinal change, and human activity had more effect on the distribution of biomass than climate. The age structure, hierarchy and crown density show close relationship with biomass.