In order to save electric energy for classroom lighting in universities, energy-saving controllers are used to control turning-on and turning-off of lights in a classroom based on the illumination intensity and the usage conditions of the classroom. Three parameters for an energy-saving controller, namely turning-on threshold, turning-off threshold, and delaying time, should be set before usage, which is usually done based on a user’s experience. In this paper, for optimizing the parameters, a multi-objective optimization model for an energy-saving controller is established. Then, fuzzy logic is used to optimize the parameters. In this way, an energy-saving controller can be used well.