The major in-home service provider in senior citizens welfare service in Taiwan is care giver. Although they should be responsible, very patient indeed, and always work hard, their benefits are so poor, lower social status and higher turnover rate. With the speeding of aging in Taiwan, the key factor for the quality of in-home service is the human resource development. This study focuses on the supply-and-demand balance of care givers, and the association between workplace learning competencies and the service performance. The objectives of this study includes: (1) to analyze the demand and supply of care givers in home service; (2) to discuss the workplace leaning roles and competencies played by practitioners in this workplace; (3) to explore the association between workplace learning competencies and service performance. This study adopts descriptive method, collecting information through literature review, interview, and questionnaires. The valid samples are 407 practitioners employed in home service, and 30 supervisors checked the survey questionnaire for correction of goodness. The structured questionnaire instrument refers to "assessment of workplace learning competency" to conduct empirical analysis and discussion developed by Rothwell. The statistics analysis is carried out with descriptive statistics, ANOVA, Chi-square analysis, and correlation analysis.