As there are more and more space scientific experiments, the amount of experiments image data to be transferred have become increasingly large and the realtime transmission requirements are also increasing. Therefore, it is very necessary to design a new type of data transmission to meet realtime and highspeed transmission of data in space scientific experiments. This paper designs a system bases on UDP highspeed data transmission, the hardware platform bases on the spacegrade FPGA chip APA300 and industrialgrade Gigabit Ethernet chip 88E1111 as the core; The portability of the system is improved by using FPGA logic resources to design data receiving logic module and data sending logic module with packaging data in accordance with UDP protocol. The rate of the system is effectively improved by using UDP data transmission technology. The experiments show that the transmission speed can reach 864 Mbps, it can meet the space scientific experiments with a large amount of data transmission.