Vaiśravaṇa is an important Buddhist deity from India to China. In China, the Vaiśravaṇa worship was once a very important belief from the Tang dynasty to the Yuan dynasty. This period of his popularity contributed a lot to his transformations towards his basic form in China. The key characteristics of his every aspect were roughly settled after this period. These characteristics derived from different aspects of his prototype in early Buddhism. To make clear the transformation tracks from his prototype to his Chinese basic form can provide great help to the understanding of his situation in China. This thesis focuses on the transformation of Vaiśravaṇa from Khotan to medieval China till the emergence of his Chinese basic form. In order to achieve this goal, it will be a comprehensive study referred to several regions as well as interdisciplinary sources.