The mathematical model on the factors and the extraction rate had been set up, and we defined the extraction technology parameters and basic extracting condition of Selenium polysaccharide.

Based on the frequency response functions curve fit method, an approximate method for extraction of sloshing model parameters about the problem of nonlinear damping is derived.

Through model checking, this model can reflect the process of extraction, it can be use as a reference for further optimizing the model parameters and technology research.