Abstract: Forests are the largest carbon reservoirs in terrestrial ecosystems, which absorb carbon dioxide, produce oxygen, conserve water, preserve soil and water, regulate climate and other functions, and play a very important role in reducing the concentration of greenhouse gases in the atmosphere and mitigating global warming. Data from the Ninth Forest Resources Inventory showed that China' s forest area was 220 million hm², with a stock volume of 17.56 billion m³, and the forest coverage rate was 22.96%. Compared with the data from the Eighth Forest Resources Inventory, the forest coverage rate increased by 1.33 percentage points, which correspondingly increased the carbon sink capacity of trees. At the NPC and CPPCC sessions in 2021, "carbon peak" and "carbon neutrality" were written in the government work report for the first time and included in the overall layout of ecological civilization construction, which attracted much attention. In other words, China' s carbon dioxide emissions must reach a peak before 2030, after which its net emissions must be gradually reduced, striving to achieve carbon neutrality by 2060. In order to further achieve the goal, China will start the construction of a national carbon emission trading market in 2021, and gradually expand its coverage of the industries, enriching the types and methods of trading. Forestry carbon sink trading based on market mechanisms has become an important means to achieve "carbon peak" and "carbon neutrality". According to the actual transaction, compared with the forestry carbon sink project under China Certified Emission Reduction(CCER)mechanism, the forestry generalized carbon trading in Guangdong Province has developed rapidly. Therefore, this paper compares the methodology of the CCER mechanism with the PHCER mechanism in Guangdong Province to analyze the reasons for the rapid development of the forestry generalized carbon trading in Guangdong Province. The results show that it has greatly reduced the transaction risks and costs of forestry carbon sink in terms of participant restrictions, baseline setting and crediting period selection, thus promoted its development. Finally, relevant policy suggestions are put forward accordingly.