Not simply to import data from non-secret computer to the secret computer through universal removable storage devices, but also to prevent classified information in the secret computer leaking through the universal removable storage devices, a data secure import system based on the technology of data diode was designed. The system's hardware and software design were presented, in which the data diode technology to the data import for removable storage device were innovatively applied. The implementation method based on dual fiber transceiver was shown, the impact on the data import reliability was analyzed, and several methods which can improve the reliability of the data import were proposed, such as "slicing-resending", "slicing-writing disk", etc. The design and methods can effectively enhance the system’s reliability and are important reference for the realization of secure import system.
