Two kinds of the dose labels, SN1 and SN2, developed by our laboratory are the yellow plastic. During irradiation to different dose using cobalt-60 gamma-ray, the color of labels turns from yellow to orange or red. Initial dose to change in to red due to irradiation are<1kGy for SN1-1 and SN2-1, 1-10kGy for SN1-2 (or3) and SN2-2(or 3), >10kGy for SN1-4 and SN2-4. In this paper using visual colorimetry, color reflection densitometry and test of the color difference the characteristics of the labels have been investigated. Color development due to irradiation is not affected by dose rates varying between 3.6 and 100Gy/min. No effect on color development is oberved with humidy between 12 and 97%, with temperature between 5 and 55℃. The labels is not sensitive to ambient light, and shelf life is over 3 years under conditions of laboratory storage. The color of labels after irradiation can satisfy archival requirements in "go-no go" . The labels of SN type can provide a visual means of determing whether a plant package was irradiated in proces, and can identify whether inventory product were processed, but theirs can give a visual indication of the dose regians of recive radiation in a plant package. These labels may cover a range from 0.1 to 100 kGy.