The civil and construction industry is the basis of industries, it has always been known as the "leading industry" and in such industry the basic material is reinforced concrete. Even in this 21st century materials science and engineering methods have developed perfectly, reinforced concrete still is the main structure material in civil and construction industry. Formwork activity is one of indispensable matters during concrete forming and hardening processes. Once the forming process has defect, it might cause the formwork collapse during the concrete placing procedure. Such damage will result in pecuniary loss or workers life. This illustrating that the formwork is one of the most important materials in the construction industry. In general, formwork is mainly used timber as its raw material. Therefore, the wooden formwork will naturally destruct and discard after repeating four to six times. But the remaining nail and chemicals treatment on the timber surface of the waste formwork always make the subsequent activity not easily. Such process does not echo to days trend of emphasis on the energy conservation and environmental protection. Besides, in order to keep the progress of the industry, all kinds of civil and construction industries are still continuous without considering the global temperature is getting warmer. But the timber, as a formwork raw material, the speed of deforestation is far behind the progress of forestation. Timber material will be deforested some day with such vicious cycle. Therefore, if there is any appropriate material to replace wooden formwork, it will be a valuable issue for further research. The subject of this research is using value analysis to compare function and cost between plastic formwork plate and wooden formwork plate. For the study analysis, due to the life cycle of the plastic formwork plate and wooden formwork plate are not the same, so this research develops the concept of life cost for doing the performance compa.