This paper proposes a cross-domain inter-government collaborative governance framework for ecological environment combining social network analysis and bioengineering, aiming to identify regional ecological risk transmission, inter-government cooperation structure and the embedding mechanism of bioremediation technology. In this study, the local government, watershed management agencies, ecological and environmental departments, and restoration implementation agents were modeled as collaborative network nodes, and the behaviors of joint monitoring, data sharing, ecological compensation, and project co-construction were transformed into relational weights, and the governance suitability was evaluated by combining plant remediation, microbial remediation, constructed wetlands, and ecological buffer zone construction. On this basis, two kinds of strategies of government-led collaborative governance and evolutionary cooperative governance supported by bioengineering are constructed. Based on the scenario simulation of typical cross-domain watershed regional data, the results show that the comprehensive risk index can be reduced to 0.31, the inter-government collaborative network density can be increased to 0.76, and the proportion of cooperative subjects can reach 88.6%. Its long-term governance effect is better than that of conventional zoning governance and government-led collaborative governance.
