Abstract: Air conditioning outdoor unit connection cable is usually made of universal rubber sheathed cable YZW. During processing, cable needs to be cut into short sections and terminals shall be crimped after stripping. However, in actual sheath stripping process, the end face was often uneven, which affected the appearance. By adjusting the amount of crosslinking agents and white carbon black in the formula, the elongation at break and tear strength of the sheath could be reduced, and the appearance of the end face will be improved. After formula adjustment, using 100 parts of chlorinated polyethylene (CM) as reference, when the addition amount of crosslinking agent and white carbon black were 5.3 parts and 6 parts, the elongation at break and tear strength of the sheath were 315% and 2.9 N·mm⁻¹. At this time, the sheath had a good peeling appearance and all properties met the standard requirements.