The authors work out the method that surface condensation of wall is measured by using Multi-Spectral Scanner (MSS), and experiments concerned are conducted on plates of aluminum, glass and iron. The results are summarized as follows: (1) The most optimum radiant intensity ratio for estimation of weight of condensation liquid water was selected. (2) The 3 correspondence models between MSS data and indices of shape of condensation beads were made. (3) It becomes clarified that the thickness of condensation beads is important index in the correspondence models.