The work aims to design a new cigarette packaging box integrated with exceptional distinction, portability and functionality. The overall dimension of the small hardened soft-pack case was designed based on the specifications and arrangement of cigarettes. A special-shaped cutting edge and "OPEN" word prompt were both designed for the self-adhesive label. A rounded trapezoidal tear was added to the inner-frame and a semi-circular outlet was specially designed for the cigarette case trademark. Meanwhile, the corresponding equipment accessories on the GDX1 hardened soft-pack packaging machine were improved and optimized. The overall dimension of small hardened soft-pack case formed by 20 middle-diameter cigarettes in the arrangement of 7-6-7 was 44.5 mm×18.5 mm×86 mm. The design of self-adhesive label, inner-frame and cigarette case trademark facilitated the realization of withdrawal and moisture retention of cigarettes. Through the improvement of package structure design and equipment accessories, the proposed cigarette case meets the applicability requirements. The new middle-diameter hardened soft-pack cigarette case can be successfully applied in the GDX1 packaging machine unit.