This is a cross-sectional analytical study aimed to identify administrative factors and organizational climate affecting the performance of health personnel at the emergency department in community hospital Roi-Et province, Thailand. The study samples selected randomly from Emergency Department were 137 health personnel. Stratified random sampling technique was applied to recruit the respondents from the total of 229 health personnel. Similarly, 12 key informants were selected for the

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... e study. In-Depth interview guidelines was applied to conduct qualitative study. The content validity of the questionnaire was evaluated by three experts yielding an IOC value more than 0.50 in all questions. The Cronbach's alpha coefficient of the questionnaire was 0.98. Data were collected between 23 rd December 2020 to 12 th January 2021. Data analysis was performed by descriptive statistics and inferential statistics at a significant level at 0.05. The study results showed that the administrative factors such as money, organizational climate such as dimension of warmth, a dimension of responsibility and dimension of identity were affecting the performance of health personnel (49.6 % (R 2 =0.496, p-value<0.001).In conclusion, four factors are affecting the performance of health personnel. Hence those factors should be addressed, and administration should create the climate which can address the budget, working objective and goal for the development of the organization.