A high-accuracy radiation calibration system of vacuum ultraviolet (VUV) detector is established,to meet the development of the ultraviolet (UV) and VUV remote quantification. In 120-220 nm spectral range,the absolute responsivity was transferred to EMR541-09-17 ultraviolet phototube detector,on the basic of national institute of standards and technology (NIST) ultraviolet standard detector. According to the guidelines for evaluating and expressing the uncertainty of NIST measurement,the relative uncertainty of transferring is less than 2.4%. The aim of high accuracy radiation calibration of ultraviolet detector in VUV region has been obtained.