［Purpose /significance］This research is put forward to adapt to the diversified forms of network resources and the personalized needs of knowledge services in various fields in the big data environment. A method is provided in this paper, domain knowledge organization for revealing the intension and semantics of knowledge units, mining the de? notation association of knowledge and providing rich and flexible knowledge service.［Method / process］The research work proposed in this paper is based on the characteristics of big data at the present stage. It is also designed a series of methods of knowledge organization from the perspective of domain application, including association organization, clus? tering organization and semantic organization.［Result/conclusion］The method proposed in this paper adapts to the deep integration and optimization innovation of the related technology and field application of big data environmental knowledge engineering