Abstract: The vehicle to grid can release the potential of electric vehicles（EVs） as flexible resources, effectively improve the peakshaving capacity of power grids, promote the consumption of a high proportion of renewable energy, and improve the economic benefits of EV users, which has attracted increasing attention from all parties. In recent years, California, USA has done a lot of work in promoting the development of vehicle to grid and has made important progress. Firstly, the latest trends of California’s supporting policy and legislation on vehicle to grid are introduced. Then,the latest progress of California’s basic work on vehicle to grid is introduced from the perspectives of technical standards and market mechanism. Finally, relevant suggestions are put forward based on the actual development of vehicle to grid in China.