Before the excavation, the site of the palaces Ta Vu and Huu Vu is two rectangular earth portions, rather flat, about 1m higher than the yard of dragons. Toward 1996, 1997, this site underwent an exploration excavation to prepare for an excavation of large extent in 2004, at a depth of 0,2m to 1,2m, which discovered many architectural planes with traces of reparations such as bordering of foundations, floors, pedestals of columns, foundation stones and column fortifications.