Abstract: In this paper, evacuation path planning of toxic gas leakage in chemical industrial park based on Floyd algorithm is proposed. Gauss smoke mass model is used to simulate the dynamic diffusion process of toxic gas in the atmosphere after the accident. Under the condition of ensuring the safety of evacuation route, Floyd algorithm is used to calculate the optimal evacuation path. This paper presents a set of optimization scheme of evacuation route selection for liquid ammonia leakage accident in chemical industrial park. The case study shows that the model is scientific and reasonable and can provide the optimal evacuation path for most buildings in the chemical industrial park.

Key words: public security, chemical industrial park, leakage, Floyd algorithm, evacuation path