A Study of the Relationships Among Employees' Personality Trails, Organizational Commitment and Job Involvement in Non-Profit Organizations. Since Taiwan has rescinded martial law, the Non-Profit Organizations (NPOs) are blustery, vigorous development, regardless of all has the obvious growth in quantity or in the social influence. How to maintain the good organization achievements in multitudinous NPOs? Makes good use of the management concept and the management technology should be indispensable. The social welfare organization belongs to the crowd service work, also is the manpower highly crowded occupation. If they do not have fully the manpower, the work is difficult to carry out, and then will affect the service quality which provides. Therefore, regarding the human resources integrity plan and the management is extremely important in the NPOs. The research motive is to discuss how will the social welfare organization organize suitable ¡§the employee¡¨ to place on the suitable seat in order to sufficiently display function, and how will the employees¡¦organization mission and the organizational commitment affect job involvement. The anticipation findings might take the superintendent in the future in the human resources policy the reference. The target of this study is the members of the Non-Profit Organizations¡¦(NPO) employees in Taiwan. The study is focused on the relations between the personality traits ,organizational commitment and job involvement of the institute. The purpose is to provide the NPO managers and employees with reference materials of boosting organizational commitment and job involvement. To fulfill the purpose, survey research is selected as the main method of this study after a serial related studying. On the other hand, through evaluating the content validity and analyzing the items and factors of the pre-test result, we can promote the Reliability and Validity of the questionnaire. The result shows that the Reliability and Validity of the study method is efficient. The statistical method includes the description analysis, factor analysis, reliability analysis,the different analysis, the correlation analysis, and stepwise regression analysis, the research result mainly include four followings: 1.Different individual attribute employees have the part differences on personality traits, job involvement, job satisfaction and organization commitment. 2.The personality traits and job involvement have extremely positive correlation; the job involvement and personality traits have extremely positive correlation; the job involvement and organizationcommitment have extremely positive correlation. 3.The factor of influence job involvement is personality traits; the fators of influence organization commitment is personality traits; the factor of job involvement is organization commitment. 4.Organization commitment have mediating effect between the Job involvement and personality traits.