The oldest surviving mosque in Yunnan Province, founded in 1312 during the reign of Emperor Renzong, stands as a direct physical consequence of the Mongol conquest of the Dali Kingdom. When Governor Sayyid Ajall Shams al-Din, a descendant of the Prophet Muhammad, consolidated this frontier, he initiated a migration of Han, Mongol, and Semu peoples. These settlers carried their faiths to Lin'an Town, establishing a sanctuary at No. 50 Randeng Temple Street.

Within the five-hundred-square-meter compound, local builders blended two worlds. The front hall retains its original Yuan Dynasty bones, featuring massive, flat-lying round logs forty to fifty centimeters thick. These rough-hewn beams, showing a three-to-two cross-section ratio, rest heavily on block-and-bracket sets called zuodou without any tie-beams. In 1730, Qing Dynasty craftsmen reconstructed the main prayer hall, measuring 13.5 meters wide and 13 meters deep. They engineered a seven-ridge roof with a hip-and-gable front and a flush-gable rear to shed the southern monsoons. Inside, eighteen carved floral latticed doors filter the afternoon light, while two ancient spring wells offer cool water for ablutions.

In 2007, the local community of fifty Hui households built a modern mosque nearby to protect these fragile wooden structures from the physical strain of daily worship. Today, the ancient site remains a quiet monument. Roof crevice flowers still bloom in the tiles, and the ancient wells still hold water, bridging seven centuries of migration, belief, and architectural survival.