Abstract: Workplace exclusion and job lassitude are common in small-and-medium-sized enterprises. As a high lassitude group, management personnel is selected as study objects. The questionnaire analysis reveals that the workplace exclusion has positive effect on managers' job exhaustion, cynicism and reduced professional accomplishment and that the workplace exclusion contributes much to managerial personnel's job lassitude in small-and-medium-sized enterprises. As a result, the study can provide theoretical basis and practical guidance for small-and-medium-sized enterprises to redress and prevent workplace exclusion and lassitude.