In order to certificate the economic distribution upon environment optimizing and the equity of regional development, the paper has summarized the study on tradable emission right, and given tentative ideas on trans-regional intercross allowance of the tradable emission right. The idea of the paper is to set the model of trans-regional emission right tradable with evident income difference, so that the rich areas can buy the emission right from the poor areas and then in return transfer the earnings to the poor areas, consequently decrease the second time pollution from upstream poor areas as well as the whole pollution amount. After using the data of Wuxi and Changzhou to prove the ideas, the paper lastly drawn out that carrying out trans-regional tradable emission right policy has special significance in China, however, Taihu Basin would be the most compatible area for practice sat present. The basic conditions such as the standard price, the regional disparity, institution for the minimum exchange cost would be prior to succeed the trade.