Background: Present study was conducted to determine the effect of training on coping efforts (CE) and stress moderators, based on transactional model of Lazarus and Folkman, in hemodialysis patients (HD). Methods: This is a randomized controlled clinical trial on 116 hemodialysis patients referred to dialysis centers in Tehran from May to August 2018. The patients were assigned to two experimental and control groups using a simple randomization method. The intervention included 6 training sessions in the form of CE and moderators of transactional model. Data were collected before and 3 months after the intervention. Data were analyzed using SPSS 16.Results: After 3 months training intervention, there was significant increase in the intervention group in the mean scores of CE (P<0.001), moderators and subscales of emotional regulation (ER) from 51.18 ± 20.42 to 64.87 ± 13.18 (P<0.001), dispositional coping style (DCS) from 45.56± 19.45 to 55.84± 18.03 and social support (SS) from 49.61 ±20.14 to 55.55 ± 17.35 (P<0.005).Conclusion: The training based on transactional model was successful in the increase of SS, DCS and ER in (HD). Therefore, Nurses and healthcare providers can use this program to help (HD) to increase their adaptation to the illness and reduce stress.