The name of Tianbaopi comes from the time of its construction - the Tianbao period of the Tang Dynasty. It is the earliest large-scale water conservancy project built in the history of central Fujian that integrates water diversion and irrigation, flood drainage and water storage, fresh water and salt rejection. project. Its construction has enabled a large area of ??farmland in Fuqing to maintain harvests despite droughts and floods, and has made important contributions to Fuqing's agricultural development, increased grain production, and increased farmers' income.

Fuqing has been suffering from drought and water shortage since ancient times. During the Tianbao period, local officials in Fuqing led the people to build Tianbaopi. On the banks of the Longjiang River and at the foothills of Wuma Mountain, craftsmen used bamboo cages to block the water, built wooden piles, quarried mountain stone cofferdams, and built Gaopi Hengjiang River interception. During the Xiangfu period of the Song Dynasty, the county magistrate Lang Jian presided over the reconstruction of Tianbao Pi; during the Yuanfu period of the Song Dynasty, the magistrate Zhuang Rouzheng moved the case under the big tree next to Tianbao Pi. Those who lost the case were punished by moving stones to repair the Pi. During the Wanli period of the Ming Dynasty, Zhou Daxun, Zhou Wenlin and his son were ordered by county magistrates Ouyang Jin and Wang Mingqing to rebuild Tianbaopei successively. In the 34th year of the Republic of China (1945), Fuqing established the Thirteen Oceans Water Conservancy Association to rebuild Tianbaopi.

According to the Records of the Three Mountains of Chunxi by Liang Kejia in the Song Dynasty: "In the second year of Yuanfu, Zhong Tiju ordered the county magistrate Zhuang Rou to repair it because of his tour, and moved it to the old land. There was a big banyan next to it. On the day of hearing the lawsuit, his subordinates used iron juice to fix the foundation, which was ten feet wide, and the fields were irrigated as before. "Tianbaopi used iron juice to stabilize the foundation, which was rare at that time.

Tianbao Pipishou (barrage project) mainly includes three major buildings: barrage, floodgate and water inlet. The bottom of Pishou Dam is made of fish scale pebbles, and the dam body is made of stone strips with a stepped structure. The dam is 3.5 meters high and the dam body is 216 meters long, of which 150 meters are old dams built from the Tang to Ming Dynasties. The water diversion inlet is set on the right bank of the dam and is connected to a 19.4-kilometer-long main diversion canal. The water diversion flow rate of the main canal is 1.5 cubic meters per second. Irrigation channels are mainly natural earth channels, natural stone channels, hardened channels, etc.

The Longjiang River Basin covers an area of ??538 square kilometers. It is the largest river in Fuqing. There is vast farmland downstream. It is 19.75 kilometers long from Tianbaopi to the outlet. The river is short and fast. It is a tidal river section, and the water quality is affected by the ocean tide. It is not suitable for irrigation.

Tianbaopi is located on the tidal section, guarding the water potential of the Longjiang River, rejecting salt water and storing fresh water. It has a key location and exquisite site selection. It has played an important role in shipping, water diversion, irrigation, flood discharge, sand discharge, etc. important role. The site of Tianbaopi is located at a higher river downstream of the bend. There is sufficient rainwater collection area and water head in the upstream, which can retain fresh water and resist the upward salt tide. At the same time, the principle of curved circulation is used to separate water and sand and divert clean water for gravity irrigation.