The structure of the database of radioastronomical catalogues has been considered. It has been located on IBM PC 486/OX2-66 with the internal memory 16MB and two hard disks of 420MB for each. The database has contained three main divisions: radioastronomical catalogues, optical catalogues and catalogues of galaxy clusters. The access procedure to this database has been described. The operation with the database in the on-line regime has been considered.