The Faculty of Business Administration, Maejo University is an upgraded faculty from the Department of Business Administration and Agricultural Marketing. Faculty of Agribusiness, which has been teaching management since 1975 to the present. has continuously produced graduates in business administration to meet the needs of the local and national development labor market. In the current circumstance, higher education institutions have more seats than the number of students who can continue their studies. From the data of the academic year 2020, the meeting of the President of Thailand (TCAS) announced the results of the TCAS qualifying examination rounds 1 - 4. There were 4 rounds of confirmation of 204,121 seats out of a total of 445,364 seats, which is not included in the non- participating institutions. TCAS contains data since 1997. The total number of births is only 880,028 people and tends to decline sequentially until in 2016 the total number of births is only 666,207 people. Maejo University was also affected by the drop in student numbers in some disciplines, including Business Information Systems and Finance. Therefore, the idea was to analyze the factors affecting the decision to study in the bachelor's degree, Faculty of Business Administration, Mae Jo University by using data mining techniques. By collecting data from 450 students from the first year of study appointments for the academic year 2021 in order to use the information for planning to manage the admissions of students. Set target groups to reach them effectively and improve issues that affect decision making for admission to the Faculty of Business Administration, Maejo University.