With the arrival of Big Data Time, the process of large -scale data has become the bottleneck problem in many fields. Data mining as a technology combines the traditional data analysis with the data processing algorithm help people get the availabl e information, However, it will become a very long time -consuming process with increasing size of the input data. The cloud computing technology which enforcing computing power in the meantime lowering cost, has a very high scalability, the emergence o f cloud computing bringing a new way for its improvement. To improve the traditional data mining algorithm, in this paper, taking the association rules as example, the improved algorithms that can be applied to cloud computing platform were proposed, Through designing the improved algorithm, the paper demonstrates the feasibility of the improved algorithm and analyse it. Experimental results show that the improved algorithms is more efficient compared with the traditional algorithm.