Abstract: Objective The status quo of the job insecurity of a medical college faculties and their relationship with the degree of engagement and job performance in the trends of classified management were systematically studied.Methods The job insecurity questionnaire, the job satisfaction questionnaire and the work performance scale were used to evaluate 385 faculties in a medical college. Questionnaire was used in 7 points,the lowest 1 point,the highest 7 point.Results The total average score of job insecurity of medical college faculties is [3.70(2.74, 4.38)]. Insecurity of payment and promotion scale is the highest of[4.57(3.71,5.57)]. The level of insecurity of excessive competition varies depending on different gender(P<0.05);The level of insecurity of job loss varies depending on different age(P<0.05);The level of job insecurity and each scale varies depending on different title(all P<0.05).According to structural equation model, engagement has direct effect on job performance, and engagement has partial mediating effect on the relationship between insecurity of excessive competition and job performance, insecurity of payment and job performance.Engagement has full mediating effect on the relationship between insecurity of excessive competition and job performance.Conclusions The overall job insecurity of the faculties involved in the survey is low, with a higher insecurity of payment and promotion. Gender, age, title have an impact on job insecurity. Totally, insecurity of job execution, insecurity of job loss and insecurity of excessive competition have negative effect on job performance, especially for insecurity of job execution, insecurity of payment and promotion mainly has positive effect on job performance. Managers should take measures to increase the positive factors and decrease the negative factors to improve job performance.

Key words: Faculties, Classified management, Job insecurity, Engagement, Job performance