The aim of present study is to investigate the effects of in-service training courses on awareness level of personnel Tondgooyan petrochemical site based on Halton pattern. The present study is applied in its objective and semi-experimental in method of data collection. In the present study, the researcher's test is used in pre-test, post-test and questionnaire stages. Covariance analysis test was used to test the researcher's questions. Validity of questions was verified through Pierson Correlation and their reliability was analyzed through Cronbach's alpha. In present study, sampling method was used to collect the necessary data from employees and based on Morgan's table, among 240 employees participating in training courses, 201 individuals were chosen but in order to avoid unfavorable decline, 220 employees were randomly chosen which led to collection of 202 completed questionnaires. Findings of present study, as presented in statistical analyses, showed the effectiveness of in-service training courses for stuff working in Tondgooyan petrochemical site in enhancing their learning based on Halton pattern.