Considering the design feature and the difficulty in radiation calibration of the multi-azimuth/multi-waveband earth limb ultraviolet (UV) imager, a method which firstly calibrated the segmented field and then integrated the data has been proposed. With a radiated comparison between the whole field and the segmented field, the output of detector shows a consistence within 1% measurement reproducibility error of the instrument, which returns back to prove the calibration method feasibility. The combined standard uncertainty of the three 290 nm, 310 nm and 355 nm UV bands is 3.93%, 3.90% and 3.84% respectively, which conforms the 3%~5% range of radiation calibration uncertainty of the UV sensors presently. With the successful accomplishment of the segmented field method for the limb UV imager, radiation calibration for greater field or more complicated sensors has been made available.