Forest carbon sink has been admitted worldwide as one of the solution to global climate change. Based on the 7th continuous forest inventory data of Guangdong province, we analyzed the best management strategy in non-forest land. We also simulated the changes of total forest carbon sink and annual growth of forest carbon sink, the forest carbon sink of the new forests and the original forests by CO_2 FIX V3.2 software. The results showed that, new forests got most carbon by considering merchant wood. In all dominant tree species, the strongest capacity of carbon sequestration was Eucalyptus. Forest carbon sink in Guangdong Province has great potential. The total amount of forest carbon sink will reach 692.1 Mt C in 2057 from 172.9 Mt C in 2008, accumulating 519.2 Mt C, with the increase of 10.38 Mt C per year. To 2057, the new forests will accumulate carbon sink about 176.6 Mt C, and the original forests will accumulate forest carbon sink about 342.8 Mt C.