On the basis of reviewing trading condition of the Chicago Climate Exchange, the thesis sums up the unique characteristics of the system, which bring in supply side and demand side to mar- ket oriented emissions trading to realize the targets. The supply side is the holder of emission credit projects;the demand side is the buyer of emission credit,who has the responsibility to cut down the e- mission level. The thesis especially focuses on the agricultural and forestry credits project, because the proportion of the tax credit project has been o...