Embodiments of the present application provide a displacement simulation method and apparatus based on a pore throat network model. The method includes: obtaining characteristic parameters of a porousmedium and constructing a two-dimensional pore throat network model according to the characteristic parameters; simulating a seepage law of a throat unit in the two-dimensional pore throat network model based on a first flow law displacement, and simulating a seepage law of a fracture in the two-dimensional pore throat network model based on a second flow law displacement; In the process of simulating the seepage flow law, when it is confirmed that the vertex pressure of the throat element in the two-dimensional pore throat network model reaches a critical pressure value, the corresponding throat element is opened to form a fracture, and the two-dimensional pore throat network model is updated. The embodiment of the present application may determine the flow rules of a fluid in a displacement simulation.