The study found that Taiwanese seafarers perceived organizational support will positively relate to job involvement. Agreeableness, one of the big five personality traits, was found to moderate the relationship between perceived organizational support and job involvement. The higher agreeableness the seafarer scores, the stronger the relationship between perceived organizational support and job involvement is. Neither conscientiousness nor emotional stability moderates the relationship between perceived organizational support and job involvement. How does the shipping company improve seafarers perceived organization support? The study suggests as follows:(1)Establish the rotation system of the land and sea jobs to expand quality family time. (2)Allocate seafarer working hours fairly. (3)Establish performance reward systems to encourage the seafarers to perform well. (4)Develop professional skills to encourage seafarers.