The carbon trading pilot market has been in operation for several years and now is in a critical period of transition from the pilot to the national level.Based on the fractal market hypothesis, this paper calculates Hurst index and finds that all the 8 pilot carbon trading markets fail to meet the standard of weak market efficiency. The trade policy and current situation of each region show that there are still problems such as oversupply of free quota. Therefore,in order to establish a national unified carbon market, it is necessary to deal with the relationship between the market and the government, maintain market flexibility, and improve the trading system to allow more effective investors to enter.