Yi Ta Hu Tu (Chinese: 一塌糊涂BBS; YTHT BBS) is a bulletin board system which was created on September 17, 1999, by student Lepton in Peking University, Beijing, China.
However, the name itself is a pun; Ta, Hu, and Tu also mean "tower" "lake" "picture" respectively, and they are used to refer to three famous sites inside Peking University: Porter Tower, Weiming ("nameless") Lake, and the Peking University Library (the Chinese word for "library" is 图书馆 tu-shu-guan, with "tu" as its first character).
On September 20, 1999, the login screen was changed to the one with a tower, a lake and the famous library of PKU.
At the same time, all the Internet forums in China were required by law to remove all discussion about YTHT.
However, since the Chinese education network is segregated from the overseas backbone, the mainland students have difficulties connecting to the BBS, which actually hurts its popularity.