Located in the east of Dien Tho palace, it was built in 1849 during the overhaul of Gia Tho palace, preparing for the four-week festival of Mrs. Tu Du [12]. Build on a rectangular lake [20], length 28m, width 20m. The ground of the building is equal to half the surface of the lake.Ta Truong Du is close to the north bank of the lake facing south.