A method and an apparatus for a synchronous motion of a human body model, where the method includes: capturing a real-time image of a real human body; determining size change information according to the real-time image, where the size change information is used to represent a size change of at least part of the real human body in the real-time image; determining motion information according to the size change information, where the motion information is used to represent a position change of the human body model along a depth direction in a three-dimensional scene, and the human body model is used to simulate the real human body; and changing a position of the human body model in the three-dimensional scene according to the motion information. The disclosure achieves a forward or backward synchronous motion between a human body model and a real human body.