In this study, the function and purpose of the disposal cover, which is an engineering barrierinstalled to isolate the disposal vault of the near-surface disposal facility for radioactive waste fromnatural/man-made intrusion, and the design details of the demonstration facility for performanceverification were described. The Demonstration facility was designed in a partially divided form to securethe efficiency of measurement while being the same as the actual size of the surface disposal facility tobe built in the Intermediate & low-level radioactive waste disposal site of the Korea Radioactive WasteAgency (KORAD). The instruments used for measurement consist of a multi-point thermometer, FDR(Frequency Domain Reflectometry) sensor, inclinometer, acoustic sensor, flow meter, and meteorologicalobserver. It is used as input data for the monitoring system. The 3D monitoring system was composedof 5 layers using the e-government standard framework, and was developed based on 4 components:screen, control module, service module, and DBIO (DataBase Input Output) module, and connected themto system operation. The monitoring system can provide real-time information on physical changes in thedemonstration facility through the collection, analysis, storage, and visualization processes.