With the rapid development and wide application of SAN technology, multi-path technology becomes one of the key technologies to achieve disaster tolerance and high performance. Based on the existing techniques, an improved multi-path storage sub-system is presented. And then improvement is made in four modules, i.e., LUN ownership management, configuration of ALUA, path selection strategy, and I/O forwarding implementation. The test results show that this scheme can be a very good solution to the path failover and load balance problems, greatly enhancing the I/O performance.