Hospital disaster preparedness is essential for being responsive against internal and external risks. This study tried to assess the level of emergency preparedness of Tehran hospitals and its relation with crisis management measures. The main objective of this study was to evaluate the emergency preparedness of hospitals in Tehran and its relation with crisis management measures. The present research is a descriptive-analytical and cross-sectional study that was conducted in 2015. The study population consisted of all the nurses working in selected hospitals in Tehran. Data were collected using the Emergency Preparedness Information Questionnaire (EPIQ). 80 questionnaires were distributed among nurses randomly and 56 of them returned. Moreover data related to accreditation measures were collected from the crisis management departments of the studied hospitals. Kolmogorov-Smirnov test and Pearson correlation were used for data analysis in SPSS. Based on the results of the study, emergency preparedness of the hospitals was not in a good condition (total average 3.6 from 5 in Likert scale), and among the dimensions accessing to resources took the least score and ethical issues took the highest score. Moreover total average of crisis management measures in studied hospitals was 75.5 per cent, and it`s correlation coefficient with hospitals emergency preparedness was 0.64, while this relation was not significant statistically (P value> 0.05). Implementation of risk management standards in current situation, cannot lead to improvements in disaster preparedness of hospitals.