Reflective solar bands are calibrated on orbit by a solar diffuser(SD) panel. The SD panel plays an important role in a set of on-board calibrator. Its reliability of the structure design will directly affect the accuracy of the on-board calibrator. In order to get the response situation of the calibration diffuse reflection plate structure under space mechanical condition, vibration test on SD panel is processed. In the test, the data on the frequency of the SD panel structure and the dynamic response are got by stochastic load test method. Meanwhile, the optical properties of the SD panel: hemispherical reflectance direction(DHR) and the bi-directional reflectance distribution function (BRDF) are measured. The results show that the frequency of the structure can meet the design requirements (more than 120 Hz), high reflectance(more than 99%), spectral flatness and good Lambertian scattering properties in reflectance, which are basic requirements for space applications.