Zhao Yidi (1912.5.28—June 22, 2000), also known as Qixia, was born in Hongkong. She was the second wife of Zhang Xueliang and was called Miss Zhao Si because she ranked fourth (female) among the sisters.

His father, Zhao Qinghua (real name Xiangshan), was born in Lanxi, Zhejiang. In the era of Beiyang government, the official was the second minister (deputy minister) of the Ministry of Communications. When Zhao Yidi was a child, he moved to Beijing with his father and attended a missionary school in Beijing. After his father was dismissed from office, he took refuge in Tianjin Concession.

Zhao Yidi, who accompanied Zhang Xueliang for 72 years, is a mysterious woman in the modern history of China. During his seclusion in Taiwan Province Province, he published works such as Good News, New Life, True Freedom, Great Mission and Yi Di Witness Collection.