The Temple of Great Purity () also known as the Upper Temple () is located on the southeastern slope of Mount Lao above the Temple of Supreme Purity. It was established during the Song Dynasty and rebuilt during the Yuan Dynasty, in the years 1297 to 1307. It is one of the oldest extant structures on Mount Lao. Like the Temple of Supreme Purity, the Temple of Great Purity features a spring. The spring in the Temple of Great Purity is called the Shengshuiyang (Ocean of Holy Water) Spring.