The Lower Huayan Temple is located in the southeast of the Upper Huayan Temple. It is constructed in 1038. Compared to the splendid upper temple, the lower one is smaller but has a far more solemn appearance.

 A variety of Buddhist scriptures are stored there. The Trinity Buddhas, that is the Past Buddha, the Present Buddha and the future Buddha, are enshrined and worshipped here, sitting on the Lotus Seat. Twenty-eight comely disciples stand around the sides of the Trinity Buddhas, among which the Bodhisattva with a pious prayer pose is the most lifelike.

The Lower Huayan Temple is centered on the Bojia Jiaocang Hall, which is the church to preserve texts of Buddhism. It has a single-eaved, nine-ridged roof. The whole building represents the architectural style of the Tang Dynasty (618-907) and is strictly built in an appropriate proportion. There are 38 two-storeyed cabinets lining along the wall in the hall. The first storey of the cabinet is a corset pedestal. There are cabinets where over 1,700 cases of sutras of the Ming Dynasty and Qing Dynasty are preserved and the sutra total up to 18,000 volumes. The cabinets have a variety of complicated designs.

Five finely carved wood-structured pavilions in the latter part of the hall are connected by arched bridges. These exquisite wood carved structures are the only remaining examples of their kind in China. Besides, the museum of Datong City is established in the front yard of the Lower Huayan Temple.