                 The research aimed to study a student assistance management system on a student management system and its affect on student,s performance at a primary educational level of private schools under the office of Chonburi Educational Service Area. The sample groups of 350 participants included administrators, classroom advisors and guidance teachers. The data was collected by a five rating scale questionnaire. Statistical analysis was applied using mean ( ), standard deviation (S.D.) and stepwise multiple regression analysis.   
               	The findings were:
              	1. The student assistance management system of the schools was at the high level. The aspects ranked by mean score included encouragement and development, individual reference, prevention assisting and correcting, screening and transferring respectively.
                 2. The student,s performance overall was at the high level. They were respectively ranked as morality, ethics and desirable values. In an aspect of working skills, they were ranked as work favor, collaborative life skills, and favorable attitude in career skills. In an aspect of knowledge and necessity skills according to core curriculum application, they were ranked as researching skills, lifelong learning and continuing self-development, analytically and synthetically thinking capacity thinking capacity including critical, constructive, considerate and visionary thinking.
3. A student assistance management system affecting student, s performance were prevention and solution (x4); promotion of student development (x3); awareness of student individual needs (x1) with predictability of 51.10. These were translated to a standard score: 
