Abstract: This paper puts forward the improved algorithm for mining association of data mining.In the natural connection way to generate candidate set before you a clip in the process, reduce the connection, and reduce the number of sets of the generation of candidate itemsets scale, reduce the iterative times and running time, at the same time in connection to reduce redundant judgement steps the judgment of the traditional method, avoid times the drawbacks.Simulation experiments show that the improved algorithm can greatly improve data inquires, speed got very good effect.