In order to put life-long learning into effect, this study explored the learning needs of adult students at subsidiary schools of junior high schools to further understand the function and value of supplementary education. It is hoped that the senior students may receive supplementary learning of a high quality. A total of 650 senior subjects (all above 64 years in age) from the 104th academic year at 11 subsidiary schools of junior high schools in Taichung City were recruited for the study. A questionnaire derived from a literature review was administered to the participants. A total of 525 valid questionnaires were collected and examined. SPSS 22.0 for Windows was utilized to disclose the learning needs and other related factors that help invigorate the senior students. Results showed that (1) the learning needs of the adult students from 11 subsidiary schools of junior high schools in Taichung City were above the median. Among the needs, health maintenance and social relationship were deemed the most important; (2) compared to male adult learners, female senior students paid more attention to hobbies. The senior learners had higher needs in the areas of pursuing further education and entertainment. The first-year students had higher needs in social relationships and hobbies. Those learners who had jobs gave weight to the opportunity to improve their expertise and education. Taiwanese students, compared to learners of other nationalities, had obvious needs in social relationships and health maintenance; (3) senior students expected instructors to teach in a progressive way, and preferred teaching materials that are more diversified and life-oriented. This study hence suggests that the educational authorities in Taiwan should place a high value on the learning styles and learning needs of senior students. More life-integrated and multi-dimensional curriculum should be added to enhance learning quality and efficiency. More importantly, our government should adjust future policies concerning supplementary education to meet the requirements of on-site education and life-long learning.