Wat Ku Prapachai was built as a Mayayana Buddhist place of worship called a arokayasala (medical station). It is assumed that it was built in the reign of King Jayavarman VII (1181 -1219 A.D.) in Bayon style during the 13th century. This sanctuary is just one of the 102 arokayasalas built in the kingdom.
All the main structures were built in laterite with sandstone used for door and window frames and for the lintels. The sanctuary consists of the central tower, a library (bannalai) situated in the southeastern corner and a boundary wall. Outside the wall there is the pond (baray).
Ku Prapachai was excavated and restored by the Fine Arts Department between 1998 and 2000. Many artifacts were found from the Bayon Period including a sandstone statue of the Buddha under Naga, partial remains of other statues, a piece of inscription and a Lan Chang style silver plated Buddha statue now in the Ku Prapachai Museum. The Fine Arts department registered Ku Prapachai as a national monument in the Royal Gazette dated 8th of March 1935.