Unity engine-based manufacturing simulation system occupies large memory when loading, resulting that the system is not fluent at run time and cannot run smoothly. In response to this phenomenon, we design a resource dynamic scheduling algorithm from the perspective of model resource loading. Firstly, the scene is recursively divided into a plurality of leaf nodes for storing through a quad-tree algorithm. Then, combined with the resource dynamic scheduling algorithm, taking the camera position as the center, the resources of surrounding nodes are defaulted instance and destruction of the prefab to complete the memory management. Finally, according to Unity's memory management mechanism, the dynamic scheduling and memory optimization of scene resources are designed and implemented.