1946年4月28日,吉黑人民自卫军解放了哈尔滨,北满分局、北满军区、松江省工委、松江军区机关进驻哈尔滨。8月7日,东北各省代表联席会议在哈尔滨第一中学礼堂开幕,15日闭幕。会议讨论通过了关于东北民主建设的施政纲领,选举产生了东北解放区最高行政领导机构——东北各省行政联合会办事处行政委员会,简称东北行政委员 April 28, 1946, Jilin Black People’s Self-Defense Forces liberated Harbin, North Man Branch, North Manchuria, Songjiang Provincial Work Committee, Songjiang military agencies stationed in Harbin. On August 7, the northeast provinces representative conference was opened in the auditorium of Harbin No.1 Middle School and closed on the 15th. The meeting discussed and adopted the policy agenda on the construction of democracy in northeast China and elected the administrative committee of the highest administrative leading body in Northeast Liberated Areas - the administrative commissions of the administrative associations of northeast provinces, referred to as the Northeast Administrative Committee