The effect of the grassroots emergency management in the risk society not only affects the development of the emergency itself, but also is related to the harmony and stability of the whole society. The analysis results of 72 public emergencies show that the initial risk state of induced crises can be di vided into three types: definite state, tentative state and uncertain state. Different combinations of the eight core factors of event risk status, event severity, prevention ability, response ability, learning ability, subject and resource coordination, participation in cultural construction and information technology level constitute six co-governing paths that affect the effectiveness of grassroots emergency management. The co-governance paths are highlighted by the collaborative path driven by multiple subjects, the aggregative path driven by cultural construction, the efficiency enhancing path driven by composite capabilities, and the empowering path driven by information technology. The improvement of grassroots emergency management effect not only depends on effective front end co-governance, but also relies on the long term maintenance of backend effects. Through positive feedback from common benefit to co-governance, it is possible to avoid the generation of new polymorphic risks, which is conducive to the long-term stability of the whole society.