The study of Emergency response plan designing is one of the most important prevention approaches in crisis management. This study aims to design emergency response plan based on case study ERP regulations in Ilam gas refinery. On the basis of risk assessment and identification techniques such as HAZOP and FMEA in Ilam gas refinery, the risks have been prioritized and then according to this prioritization, the design of possible scenarios, which have the highest rate of occurrence and the

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... t level of damage, has been separated. Possible scenarios were simulated with PHAST software. Then, emergency response program has been designed for the special mode or similar cases. According to the internal emergency response plan for Ilam gas refinery and predictable conditions of the process, special instructions should be considered at the time of the incident to suffer the least damage on people and environment, in the shortest time possible.