The traditional appraisal approaches in molding industry, such as experiential appraisal, and decomposing and converging appraisal are unable to be satisfied with developing demands of molding industry in such a new trend because there are some disadvantages , such as incomplete data, depending on personal experiences excessively, and hard to set a standard. For this reason, it is very important to figure out how to estimate mold cost scientifically and reasonably, proceed appraisal precisely, and then come out a correct mold cost. On the strength of personal experience in mental molding industry, I opened up and developed a molding unitary counting system in which you could appraise the developing cost by piece to lessen time waste shown by EXCEL in the WINDOWS platform