Conclusions Chilled energy storage is a good way for safe operating of power grid and can make good use of peak-valley power price for cost saving in China, but it is not just for this application. The paper provides two air-conditioning system with chilled energy storage,one can use part of chilled water back from user to adjust temperature of chilled water supplied for user, the other system uses chilled storage technology to improve offcondition performanceof air-conditioning system