Abstract: In this paper, the level-by-level optimization sequence model is proposed for the pro-duction planning of chemical enterprises. Many variables are decentrilized level-by-levelwith the sequence method, so as to make it easy to model and optimize the system. Theproduction planning of a factory is established based on the model. It has been provedthat the model can precisely describle the characteristics of the production structure andthe process of planning, then increasing the profit. These methods are also suitable forsimilar enterprises.