Abstract The development of the nutritionist will be twenty years in Taiwan. The role of nutritionist is changed from meals management of group to education and consulting of nutrition in the period of the prosperous eighties till now. In the meantime, the top ten causes of death are changed from emergency medical case to chromic disease in Taiwan. The custom of weight reduction is spread over Taiwan in the eighties. The general public is eager to receive the instruction of nutritionist. However, the diet therapy of various chromic diseases takes place of weight reduction that is gradually disappeared in Taiwan now. The nutritionist still play important role in maintenance of healthy group and preventive medicine. There are few local researches to be related with the nutritionist. I hope to achieve the effect of promotion by means of this research. There are three destinations in this research. One, the occupational commitment of local nutritionist is understood. Two, the factor is ascertained by the influence of occupational commitment of local nutritionist. Third, the relationship between occupational commitment and leave attitude is confirmed. The researcher initially discusses how viewpoint and expectation of nutritionist is influenced by various occupations through individual interview. And then the evidential research structure and questionnaire is developed to investigate occupational commitment and its influence factors of local occupational nutritionist. The result of research is listed below: 1. Occupational commitment is evident relevant to the gender, position of occupation and location of occupation that is belongs to the variation factors of nutritionist. Among the investigation, occupational commitment of female is stronger that the occupational commitment of male, and occupational commitment of manager is stronger that occupational commitment of non-manager, nutritionist of body fitness center gives much commitment than the nutritionist of hospital, school and other location. 2. Occupational commitment is negative evident relevant to locus of control that is one influence factor of occupational commitment. Occupational commitment is positive evident relevant to work involvement, work satisfaction, organizational commitment and feeling of external environment. The employee that has personality of self-control has more occupational commitment. Occupational commitment of nutritionist can be enhanced by the positive influence factors of occupational commitments. 3. Sentimental commitment is stronger and standard commitment is weak between the occupational commitments of nutritionist. Work satisfaction is much influenced by sentimental commitment. The human resource manager of nutritionist urgently implements the various policies to enhance work satisfaction. 4. Work performance is evident positive relevant to occupational commitments, especially the relevance of sentimental commitment is much evident. Leave attitude is evident negative relevant to occupational commitments. The higher occupational commitment of nutritionist has the better work performance and poor leave attitude. Key words: occupational commitments, locus of control, work involvement, work satisfaction, organizational commitment, work performance, leave attitude.