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Aimed at produce various types of aircraft test signals : three channel of RS422 signals ,ten channel of RS485 signals ,two channel of pulse signals which frequency and number was adjustable,and four channel of multiple charged instructions .A high-speed signal source was designed based on Ethernet technology . The logic control of this Signal Source was completed by FPGA , and it adopted a unified communication protocol . Through Ethernet chip W5300 to communicate with the host computer, this system achieves high speed and long-distance transmission of various signals, and the speed of it can be 40Mbps. The experimental proved that this system has the advantages of reliability and interchangeability , it can efficiently and entirely complete the various functions test of aircraft ,which meets the requirement.