The current research entitled "Pathology of employees training process in National Oil Products Distribution Company to improve their effectiveness using a three-branch model" was conducted in five areas of Rasht, Chalous, Sari, Gorgan, and Bojnourd. The objective of this study is to identify the harms related to employees training and to introduce an effective model of employees training. This study is considered as an applied study in terms of nature and objective and mixed study in terms of investigating the variables. The research population in the qualitative section included managers, deputies, heads of departments (n=24), and in the quantitative section, it included 999 people, that 277 of them were selected as sample of the study based on Cochran formula. The tool to collect data in the qualitative section was grounded data method using a semi-structured interview. In the qualitative section, data were collected using field method and through researcher-developed 167-item pathology questionnaire and 120-item effectiveness questionnaire. The face and content validity of the research tool were confirmed by the professors and experts. The reliability of the questionnaires using the internal consistency and Cronbach's Alpha method was estimated 0.98 and 0.98, respectively. Data were analyzed by Friedman Rank test, exploratory and confirmatory factor analysis using SPSS20 and AMOS20 software. The results were obtained as follows: 1- In evaluation of effective components in employees training, 41 components were identified and ranked in process section, 72 components were identified and ranked in the structural section, and 16 components were identified and ranked in contextual or environmental section. 2- In process dimension harms, the components of job motivation (0.91), organizational indifference (0.78), job beliefs (0.78), searching (0.73), distrust (0.70), cognitive factor (0.63), learner preparedness (0.62), job attitude (0.53) and individual characteristics (0.49) were confirmed. 3. In the structural dimension harms, the components of educational design (0.97), centralized system (0.91), supervision (0.78), teaching (0.86) and organizational factor (0.85) were confirmed. 4. In contextual dimension harms, the components of communication with the university (1), political-economic factors (0.78), social communication (0.72) and non-supportive culture (0.56) were confirmed. The fit of research model was confirmed based on confirmatory factor analysis. In this model, the process dimension with the value of (1), the structural dimension with the value of (1), and the contextual dimension with the value of (0.9) explain the employees training variance.