With the rapidly development of the information field, data mining technology is widely used in the field closely related with the people life. This paper improves the traditional algorithm based on the association rule data mining technology and the problems of Apriori algorithm of association rules mining. It analyzes the differences between Apriori algorithm and granular computing algorithm through the empirical analysis. The result shows that the granular computing data mining association rules are more feasible and effective in data processing. It can provide necessary conditions for the construction of open data mining platform.