The objectives of this research were: (1) to study the results of integration of Buddhist doctrines to promote and develop the core value of the primary school students before and after participating in the activities for cultivating the core value; and (2) to compare the levels of the core value of the students at Wat Sukantharam School in Talo Sub-district, Wang Noi District, Phra Nakhon Si Ayutthaya Province, Thailand, classified by the samples' personal factors (gender, family status and parental occupation). This study is Quasi Experimental Research carried out with 32 students in the mentioned school based on Purposive Sampling. The tools used in data collection were the questionnaire and in-depth interview form. The statistics used in quantitative data analysis included: Mean, Standard Deviation, t-test and f-test while that of qualitative research obtained from the key informants: school administrators, teachers and student parents is analyzed and synthesized based on descriptive analysis. The research results reveal that: (1) the levels of the core values of the students before ([x-bar]= 4.55, S.D.= 0.210) and after activity participation ([x-bar]= 2.21, S.D.= 0.581) were statistically different with the significance level of 0.05; and (2) the comparative results of the levels of core value of the students suggest that the students with differences in studied personal factors (gender, family status and parental occupations) have indifferent core values both in overall and aspect perspectives with the statistical significance level of 0.05. The research results suggests that Thai educational institutions should set a policy to promote inclusive participation of all sectors such as family institutions (parents), temples (religion), schools (educational personnel) or government agencies responsible for the service area take part in the development of student core values through systems and mechanisms that can conduct a systematic measurement and evaluation.