Abstract: Keeping in mind the end goal to change the correspondence circuit board status that the speed is low and transmission separation is reserved for control reassure of the marine test system which is composed of the researchers. Considering the average for correspondence progressively between the PC and monitoring reassure of a sea test system, an extended proposition is displayed as well as executed. C8051f 340 chip and XR16L788 chip are individually received as the center of equipment part and the universal Asynchronous receiver/transmitter. The testing result demonstrates that the proposition can meet the necessity of ongoing correspondence between the PC and support of marine test system.