With the existence of a cold drink business that has mushroomed, Thai Tea business owners need to think about finding new marketing strategies to increase sales, one of which is by using data mining processing so that the sales transaction data not only functions as a sales report, but also to find out the stock of beverage ingredients and buyer demand can be fulfilled, Determine which variants sell the most so that they can find variants with the highest and lowest interests. Apriori algorithm including the type of association rules in data mining. This study implements a priori algorithm for the purchase of beverages with a minimum support of 30% and a minimum of 60% confidence, and the results of the most widely sold Thai Tea variants are Thai Grass Jelly, Thai Taro milk, Thai Mango Yakult, Thai Milk Tea with support values 32.3% and confidence value 76.9%.