Abstract: Social rescue resources are the supports and key factors to ensure the efficiency of emergency rescue. From the analysis of the real cases, this paper proposes that social rescue resources have three characteristics: large demand fluctuation, short demanding period and hard to forecast demand kinds. Based on these characteristics, the social rescue resources supply were divided into two subsystems: social rescue resources reserves and social rescue resources mobilization. Assuming there is no information delay, the system dynamics was utilized to model social rescue resources reserves, social rescue resources mobilization and social rescue resources supply. Results of simulation can verify the feasibility and effectiveness of the models.