In order to improve the ability of community governance and reduce the occurrence of accidents, based on the entropy and self-organization theory, this paper first analyzes the influencing factors of community resilience, analyzes the process of emergency and the key factors of response from the change of entropy value of community security system, constructs the mathematical expression of community resilience and entropy value, extracts the evolution law of community resilience, and then constructs the decision theory of building entropy effect and improving community resilience from the perspective of input-output benefit. The results show that the community resilience is positively correlated with the absolute value of negative entropy; the community resilience is negatively correlated with the absolute value of positive entropy; the system resilience can be improved by allocating the limited degree and quantity value according to the importance of the impact on the correlation of each subsystem in the community system.