The paper analysed 5 types of improved forests such as low-function poplar timber forest,lowfunction green channel landscape forest and low-function urban street landscape forest. The results showed that 3979. 4hm2 of low-function poplar timber forest was transformed,carbon sink accumulation increased by 543814. 8t,amounting to the value of 32. 629 million yuan,besides,the wood value added by 316. 626 million yuan. low-function farmland shelterbelt forest were transformed 2897. 5km,meanwhile protection farm...