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In July of 2021, electricity industry became the first to be included in the national carbon market, with more than two thousand emitters. As electricity industry is the transaction main body of carbon trade market, scientifically examining the carbon emission efficiency of electricity industry and discussing whether the implementation of carbon trading market has positive effects on carbon emission efficiency provides realistic value for low-carbon development and helps to achieve dual-carbon target. This article by using three-stage DEA model based on input-output production function idea, evaluated and ranked the carbon emission efficiency of electricity industry before and after the carbon trading market is established. The result showed that: 1. Most of the pilot cities have remained elevated or unchanged after the establishment of the carbon emissions trading market. Only Guangdong is at the forefront of production, and other provinces have room for improvement in terms of technical efficiency and scale efficiency. 2. China's carbon emission efficiency level has certain shortcomings in both the technical level and the scale level, and local government should emphasize on the internal management control. And by convergence tests, the result indicates that there is convergence in carbon emission, before the establishment of carbon trading market, but no convergence after establishing the trading market. There is no absolute β convergence. And conditional β convergence exists before the carbon trading market is built, while no conditional β convergence after establishing the trading market. Carbon emissions trading volume is insignificant related with convergence. This paper draw suggestions that government should keep improving the nation carbon trading markets, improve the internal management of carbon emission, adjust and narrow regional emission gaps and continuously optimize and improve the regional industrial structure.
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