File migration strategy in heterogeneous storage system is needed with low migration cost, high efficiency and strong adaptability. Study current file migration strategy, a new file migration strategy based on energy model was presented. The energy model was developed to describe the data access load on the storage units. The energy model was developed to describe the file access rate on storage units. The random early migration scheme was proposed to reduce the performance decline caused by the skewness requests in heterogeneous storage system. The new file migration method based on data access was used to minimize the migration cost. Simulation experiments were performed to prove the efficiency of the file migration strategy based on energy modle. The experimental results show that, compared to the traditional disk cooling strategy, the averagy file access response time and system throughput of the new strategy are higher than that of the traditional disk cooling strategy by about 15%~20%.