Limen introduction: The academy has two walls, the inner and outer walls. The outer wall is built with blue bricks and pink lime on the outside, with small tiles on top to protect the wall. The perimeter is 116.3 meters long from north to south and 47.6 meters wide from east to west. Limen, also known as the West Gate, is a relic of the Qing Dynasty. The plaque on the door "Ehu Academy" was inscribed by Li Chun (the magistrate of Qianshan County) of the Qing Dynasty.