An isolation card for network includes interface used for data exchang with inside of the computer and interface used for data exchanging with outside of the computer, data processing unit, data receiving unit, data sending unit, system clock, and reset unit. The present invention's isolation card has its hardware which can carry on hardware isolation between networks physically and apply self-defining transmission protocol as well as transmission method to data transmission. It is only to set a card of isolation at any operation station or server of both party's network with no change of original network dilatation structure at all, but the two networks can be realized with data safe transmission and data sharing through connecting with special data connection line. |