With electricity marketization for over 20 years，United Kingdom（UK）has established a relatively complete electricity market system.However，owing to global climate change and environmental factors，the UK third electricity market reform attempts to ensure that the future electricity supply is secure，low-carbon while affordable.According to documents released by the UK government in recent years，this paper summarizes and gives an account of the main contents of the UK electricity market reform，including feed-in tariff with contracts for difference in price，emissions performance standards，capacity market and carbon price floor，regulatory asset base and others，and a brief discussion of the expected results.Finally，the enlightenment significance to China’s power market construction is described.