Abstract: Based on the structural characteristics of rearview mirror bracket of automobile, an injection mold with double-parting surfaces was designed by use of UG NX. A reasonable submarine gate location was selected with the help of the computer-assisted engineering analysis and the practical design experience of die and mold. Aiming to difficult processing problems, the insert inlaid way was used for the shaped part. Aiming at the difficult problem of demolding, the different types of side core-pulling mechanism were designed, especially for the two-way angled core-pulling in the same position. An innovative differential combined corepulling demolding mechanism was designed. Such a structural design was confirmed to be reasonable and stable.