The non-linear method of multi-agent architecture was adopted to survey the method of knowledge discovery of domain knowledge in knowledge-based system(KBS).Firstly,a parallel model for knowledge discovery based on multi-agent was proposed,and current models for knowledge discovery were extended.Then,this model was applied to knowledge discovery of domain knowledge in KBS.Finally,a distributed platform of knowledge discovery for KBS was designed.Analytical result shows that the method is feasible to resolve distributed knowledge discovery of KBS.