塘沽協定
In May 1933 Yin Tong became a Chinese negotiator on the Tanggu Truce. In next month he was appointed advisor to the Beiping Political Affairs Readjustment Commission　() and member to the Requisitioning Committee on North Chinese Military Region. He became a brain to the Chairperson of the Readjustment Commission Huang Fu, and was in charge of negotiating with Japan. In October he was transferred to director of the Administrative bureau of Beining Railway (). He successively held the positions of adviser and counselor of the Ministry for Railway.