The Lower East Old Tombs(東下塚) of Neungsan-Ri Old Tombs in Buyeo is wall painting tomb in Baeckje and was under progress of weathering according to change in environment of internal tomb.There are three holes which were used in grave robbery.Through these holes, earth and sand, various foreign substances were being flowed into inside, which was a direct cause of change in environment of internal tomb and damaged wall painting.To restrain wall paintings weathering, external pollution factor should be blocked out and at the same time, measure to monitor intemal environment be arranged.To prevent inflow of pollution factor through holes used in grave robbery, stainless structure was installed inside the tomb and the holes were recovered with stone same as stone of wall.Stainless door was installed between main chamber, antechamber, tomb entrance passage.This is for separate management of each space to cope with change in internal environment.And installing Data Logger for temperature and humidity in each space, change in internal environment (temperature and humidity) can be monitored.The result of monitoring can be utilized as data for preservation environment of Old tomb wall painting forward.