This article introduces how to choose three major characteristics of leather hand-stitching thread, paying special attention to Fil au Chinois Filkin hand-stitching wax thread from France. The brand has been producing high-quality sewing threads in France since 1847, and its main customers include well-known brands such as HERMES. Fubao Crocodile Workshop uses Fil au Chinois yarn when hand-sewing customized products. The article emphasizes that the process of hand-sewing leather goods requires the selection of suitable threads, and introduces the three major characteristics of Fil au Chinois wax thread: durability, rich color selection, and uniform thread waxing.