This paper describes a value growth design which is one of a typical means to embody a timeaxis design. The timeaxis design is a new design which introduced time axis into the theory and methodology of design. On the other hand, the value growth design is a design which appreciates in value with time progress. Clarification of the feature in value growth of artifacts and analysis to case research or literature documentation are performed in order to be contributory to construct a value growth design methodology. Moreover, the value growth design model based on these results is proposed. Additionally, viewpoints considered to be useful to the proposed value growth design model are discussed.