This paper concerns the development of soldering in early China. Soldering requires the use of an additional heating of metal to join two or more existing metal items together. The paper defines the different soft and hard soldering materials. It also describes the evolution from joining two pieces, an animal head and a vessel with additional pour of bronze as an extension of the casting process. The next step was the use of hard solder, using bronze or copper related materials. There were two ways to join the existing bronze sections: the most common was “tenon soldering”. Less common but equally significant was “injection soldering”. In the late Spring-and-Autumn Period, soft soldering with tin and lead was developed. This step allowed much more extravagant decoration of bronzes, leading to new bronze vessel styles and also to much greater sub-division of labor in the production process.