The present disclosure provides a motion control method and apparatus, and a method and apparatus for generating a trajectory of a motion. The motion control method is applied to a robot, and includes: generating, according to a type of a desired motion, at least one motion phase of a motion process and a time for each motion phase; determining, according to the at least one motion phase and the time of each motion phase, a desired pose of the robot at at least one node during the motion process; inputting the desired pose as a reference value into a cost function model to obtain a trajectory of the desired motion, where the trajectory includes a pose and a control parameter of the robot at each sampling point during the motion process; and controlling the robot to move according to the trajectory of the desired motion.