The characteristic research of silicon trap detector is of considerable significance in optical radiation measurement.The absolute spectral response and quantum efficiency are the major parameters which can reflect the performance of the detectors.The silicon trap detector is calibrated against the cryogenic radiometer with the expanded uncertainty better than 0.05% at 11wavelengths between 325nm and 980nm.The internal quantum efficiency is interpolated from 325nm to 980nm.The calculated results are compared with direct measurements using to cryogenic radiometer.The results show that the deviation between theoretical calculation and experimental measurement values is less than 0.03% in the middle range from 325nm to 980nm,but the deviation are bigger on both ends of the band.