System for transferring data only in one direction

The present invention relates to a system for one-way data transmission. The system transmits data from a high security level network to a low security level network in one direction and receives data verification results through a separate line, so that access from the low security level network to the high security level network can be physically blocked, in turn, guarantee security. At the same time, the system can deal with packet loss or bit errors occurring during data transmission, in turn, increase the reliability of transmission. [Reference numerals] (110) Data transmission module;(120) DVR reception module;(130) Transmission data buffer;(140) First DVR memory;(150) Fist DVR inspection module;(210) Data reception module;(220) DVR transmission module;(230) Second DVR memory;(240) Reception data buffer;(250) Second DVR inspection module;(500) First network;(600) Second network