It has been changed from conservative method that require partial destruction of concrete structure to new method that is nondestructive method or require just tissue of concrete structure for the stability evalution of concrete structures. The estimation technique that is the purpose of this project are very forehanded at the time of state-of-the-art equipments that give diagnosis work efficiency and accuracy is presented in this study. This study included that the discovering a equipment for collection of concrete powder, the suggestion of thermal analysis at the estimation of neutralization of concrete, the estimation technique for suggestion of appropriate repair time, the estimation methods that are to presume carbonation processing amount and to assume damage degree caused by freezing and thawing action.