Abstract: The storage box used in sport utility vehicles has a complicated structure, and it is difficult to be ejected during the injection molding. The forming process of a storage box was analyzed, and a hot runner system was designed. In the injection molding system of this storage box, a two-step slide-pulling mechanism of lifter in slide was designed because of two neighboring perpendicular holds. Moreover, a two-step slide-pulling mechanism in slide was also designed, because the storage box was easy to be damaged when the slide was pulled. Considering of a difficulty in ejection due to overhigh columns and reinforcements, the lifter was designed. The results indicated that the mold designed in this work had a reasonable and reliable structure and it could meet the requirement of production.