First analyzed Some problems in our Forestry carbon sink trade field,and thought these problems are induced essentially by the informational incompletion.Then it introduced the function of the information system of the forestry carbon sink which based on web and regarded the system as a good way to solve these problems. And finally analyzed roundly the flow chart of China forestry car bon sink projects ,and set its goal based on the needs of all participator in the projects,combined information technology with the forestry carbon sink ,and put forward a way to resolve the problem in this field.