In order to test function of spectral signal processing module, a spectral data transmission system is implemented by DSP and embedded Ethernet technology, and TMS320LF2407A and CS8900A are used as core chips. The system scheme design is introduced in detail, and the implementation of software and hardware are also described. Spectral signal processing module is tested, and the result shows that the system can transmit spectrum data real-time and reliably, and can be well applied to practice.