The technique of Nijin has a long history and has been used in religious murals, Buddha statues, Thangkas, and related artworks. Its application of gold creates a simple, rich and textured effect, giving Buddha statues delicate and warm skin. This technique played a vital role in the production and decoration of bronze Buddha statues during the Qing Dynasty. However, among the existing bronze Buddha statues in the Palace Museum, many have suffered from serious deterioration (such as hollowing, cracking, flaking, detachment, and loss) in areas made with the technique of Nijin. To address these problems and effectively prevent further deterioration, it is essential to first identify the gold-working method and specific processes of the technique of Nijin. However, there are few historical documents describing its application to bronze Buddha statues, and no scientific analysis or discussion from a perspective of testing. In this study, to preliminarily determine the gold-working methods and the specific processes of the technique of Nijin in Qing Dynasty bronze Buddha statues from the collection of the Palace Museum, we selected five Buddha statues as the research objects. We combined scientific testing and analysis with historical records for mutual corroboration. The results could provide a theoretical foundation for future conservation treatments and technical restoration practice.