A set of laser field information sending and receiving system has been designed on the basis of analyzing the principle of laser beam riding guidance.It realizes the pulse modulation and demodulation which simulate the laser filed information in practical guidance system.The system is designed and developed based on the filed program gate array（FPGA）.The simulating guidance instructions which are input with the keyboard are processed by a series of logic in the FPGA.The corresponding electronic pulse signals are output which drive the laser to simulate the modulated optical information fields for beam riding guidance.Then a PIN photodiode is used as the detecting device to receive the optical information emitted by the light emission system.The electronic signal outputted by photodiode are amplified and shaped by the circuit of receive system,and then the laser information field is obtained.The system can be used in the simulation and test of laser beam riding guidance.