We examined degradation characteristics of lead based pigments(White lead, Red lead, Litharge) according to atmospheric environmet condition, for example UV, atmospheric gas(CO 2 , NO 2 ) and soluble salt. Painted samples not changed material compositions but were occured the color change(ΔE 4~31) after exposed UV irradiation. All samples were not affected by CO 2 gas not only color but chemical composition. However, samples were remarkably changed color exposed NO 2 gas and it was formed secondary product like as lead nitrate. Such as red lead and white lead samples' color difference were ΔE 2 and ΔE 10 respectively and became dark, along with litharge became bright and color difference was ΔE 5 after react with NO 2 gas. It confirm that NO 2 was influential factor than CO 2 in the case of same concentration. Furthermore salt spray test was taken to figure out soluble salt influence in fine dust. The result showed noticeable color change and secondary product was formed on samples' surface. The glue film peeled off or hole, and color changed around the secondary products. After salt spray, XRD pattern showed decrease peak intensity and lower crystalinity. As a result of salt spray test, white lead was formed new product litharge and litharge was formed litharge and minium. According to the results, influential atmospheric factors for conservation of paint pigments were UV, NO 2 , soluble salt, and litharge was most weakness throughout lead base pigments.