This research aimed: 1) to investigate the components and indicators of working achievement motivation competencies of welfare school's teachers; 2) to examine the needs to develop working achievement motivation competencies of welfare school's teachers; and 3) to develop the program to strengthen working achievement motivation competencies of welfare school's teachers. The mixed methods research was employed by divided into three phases. Phase one, investigated the components and indicators of the working achievement motivation competencies. Components and indicators were verified by 7 experts. Phase two, examined the needs to develop working achievement motivation competencies of welfare school's teachers. The respondents were 340 welfare school's teachers. Phase three, to develop the program to strengthen working achievement motivation competencies of welfare school's teachers and verified the program by 9 experts. The research instruments were the components and indicators evaluation form, the existing and desirable situations questionnaire of working achievement motivation competencies, and the program evaluation form. Statistics used in analyzing data were mean, standard deviation and priority needs index modification. The research findings were: 1) The components and indicators of working achievement motivation competencies of welfare school's teachers were categorized into 6 components and 32 indicators; 2) The needs to develop working achievement motivation competencies of welfare school's teachers were ranked from high to low: creativity, performance commitment, performance evaluation, flexibility, the quest for information, and development of operational competence; and 3) The program to strengthen working achievement motivation competencies of welfare school's teachers consisted of rationale, objectives, content, model and methods, 6 modules of program structure, and application and evaluation.