Abstract: A method and a system for simulating a three-dimensional (3D) operating interface are provided. The method includes defining a partition line to partition a display frame of a screen into a first area and a second area, and defining a size of a unit grid to establish a first grid plane and a second grid plane in the first area and the second area respectively, the first grid plane and the second grid plane forming a simulated 3D grid space. The method also includes taking the unit grid as a unit to define an object size and an initial grid coordinate of an object. The initial grid coordinate is on one of the first and the second grid planes. The method further includes mapping out a simulated 3D space in the simulated 3D grid space for displaying the object according to the initial grid coordinate and the object size.