Electricity tariffs are important components in national economy price system. Whether electricity tariffs are reasonable or not impacts directly national economy's development and effective utilization of electricity. However, there are relatively serious problems in our country's electricity tariffs structure and level.Firstly, this paper analyzed and summarized 21 countries' electricity tariffs setting mechanism and regulatory methods including China. Secondly, this paper compared tariff data of China with other countries, which are provided by National Economic Research Associates of UK. According to this comparison, the paper shows further that china's electricity tariffs structure isn't rational and tariffs level is low by international standards.On the basis of analysis of the data, we cognized that transmission and distribution tariff's problem is the grimmest. Therefore, this paper estimated the electricity grid enterprises' reasonable ROA (Rate of Asset) using the Capital Asset Pricing Model and according to the ROA figured out the new transmission and distribution tariffs. Finally, this paper analyzed the consumers' affordability with regard to the new tariffs.
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