Cai Yuanpei's former residence is located at No. 75 Dongtangzi Hutong, Dongcheng District, Beijing. This is a rental residence during Cai Yuanpei's tenure as president of Peking University from 1917 to 1923. It is closely related to the May Fourth Movement. I have been here many times 30 years ago. At that time, it was still a messy Dazayuan. It was not here for some years. It has now been renovated. It is a cultural relics protection unit in Beijing. But it came three times and all ate closed doors. I don't know why? Now I can only take pictures outside and leave a thought.