Due to the wide range of psychological variables involving in the job accidents, working on job accidents is one of the most important issues in industrial and organization psychology. The aim of the current research was to investigate these psychological effects on job accidents in soft and hard domains. Statistical population was all personnels in a big factory in Tehran.From which two samples including 384 and 322 participants were randomly selected and responded to the research instruments. Instruments were the Differential Aptitude Test (DAT), the Numerical Reasoning Test, the Tool Matching and Motor Dexterity from the General Aptitude Test Battery (GATB), the Precision and Coordination subscales of the Flanagan Industrial Test, Noise Self Efficacy, the Social Maladaptation and the General Health Questionnaire.Intercorelations between the variables indicated that social maladaptiation and distraction (soft level) and motor dexterity and shift work had the most powerful relation with accidents. The data were analyzed via path analysis. Some variables had direct and indirect effects on the accidents. In light of these results, as well as related literatures, identification and controlling of the accident related variables are discussed and some suggestions were made for the researchers and managers.