Abstract: A method and apparatus for determining a strategy for medium- and long-term purchase and sale of electricity. The method includes: obtaining a post-transaction position held, a post-transaction total position price, a total load expectation, a total risk electricity fee, and an expected electricity fee according to known information of a target time period; and determining a purchase and sale strategy according to the total risk electricity fee and the expected electricity fee. The purchase and sale strategy with the lowest expected electricity fee is obtained by means of certain constraints on the transaction volume of medium- and long-term contracts and upper limit constraints on risk electricity fees. The expected electricity fee is used as an optimized objective function, and comprehensive optimization is performed on the basis of diversified constraints to obtain the optimal electricity fee strategy with load constraints and controllable risks.