A multichannel highspeed pseudorandom sequence generator with common use has been developed. This generator is achieved by parallel/serial and clock tree based on FPGA, includes 4 parallel channels. The alternating frequency can be changed online. There are several choices for the pseudorandom sequence, such as m sequence, Bernoulli sequence or others. Signal integrity simulation for highspeed signals has been executed. Hardware tests validate that the experimental results and simulation results are consistent, the positive and negative margin of error is less than 100 mV, the minimum pulse width is 0.5 ns, and the transition frequency of the designed highspeed pseudorandom sequence generator can reach 2 Gbps. This highspeed pseudorandom sequence generator can be used in modulated wideband convertor as a mixer function, and can also be used in communication or radar, ultrasonic ranging domain.