The analysis of the existing typical hybrid store architectures in big data center found that they cannot fully take advantage of both hybrid storage management systems and hybrid storage devices. Thus a hardware and software co-design data placement strategy was proposed, which simultaneously considers the hybrid storage management systems at software level and the hybrid storage devices at hardware level, and figures out the trail of data placement on both storage systems and devices regarding application characteristics. Moreover, the static placement pattern before running and the dynamic placement pattern during running were proposed on the basis of different application scenes. An experiment was implemented by running three kinds of workloads on simulated data placement strategies based on the model according to the performance parameters of storage management systems and storage devices. The results show that the proposed design outperforms traditional ones that either consider storage management systems or storage devices separately by up to 30%.