The study with the questionnaires investigated the present status of professional development management at three primary schools in Vinh Long City, Vinh Long Province, in the Mekong Delta region, South Vietnam including Chu Van An, Nguyen Hue, and Le Loi with 140 respondents, including 8 school managers and 132 teachers. This research aimed to survey the current situation of management of professional development (PD) training activities for teachers in primary schools in Vinh Long City, Vinh Long Province and to propose measures to manage professional training activities for teachers. The finding revealed that managing professional training activities for primary teachers needs in Vinh Long City, to ensure that the activities are both scientific and artistic. It needed to be carried out toward set plans and systems, ensuring proper implementation of principles, functions and timely and scientific inspection, evaluation and adjustment. It also requires skillful and flexible application of experience and accumulated knowledge in human-to-human relationships, which helps teachers have full knowledge and professional skills to perform well teaching and education work.