1949年1月31日，北平和平解放。2月8日，成安玉率领邮政处人员进驻北平邮政管理局，按照“各按系统、自上而下、原封不动、先接后分”的办法开始接管北平邮政系统。中国共产党对北平邮政系统的接管，既参考了早期接管城市的经验，又为后来者提供了新的借鉴。

为适应新政权和首都建设需要，党对北京邮政系统的组织机构、管理体制、人事制度和业务内容等进行一系列改造，并借助“邮发合一”体制有效扭转了新中国成立初期混乱的报刊发行局面，使党的权力有效介入了政治宣传。邮政凭借局所众多、邮路纵横的优势，成功地将党报党刊传播至社会基层，潜移默化地完成了对人民群众的政治认同教育，邮政的政治职能空前凸显。“一五”计划时期，北京邮政积极改进和完善生产，通过推广先进生产经验、加强合理化建议工作、开展先进生产者运动等手段，提前超额完成五年计划任务指标。

1949-1957年，北京邮政在党的领导下，焕发出巨大的发展潜力，发挥了重要的社会功能。不仅企业自身迅速实现扭亏为盈，还助力了国民经济的恢复和发展，以及新生政权的巩固。

On January 31, 1949, Peking was peacefully liberated. On February 8, Cheng Anyu led the post office personnel to Peking Postal Administration, beginning to take over the Peking Post Office System according to the method of "by system, top-down. wholly intact, takeover then division". The takeover of Beijing post office system by the Chinese Communist Party, not only drew lessons from the experiences of the early takeover of the city, but also provided new references for the latecomers.

In order to meet the needs of the construction of new regime and capital, the party carried out a series of reforms on the management system, personnel system and postal business for Beijing post, and effectively integrated the chaotic press distribution with the help of the system of “post office publishing”, so that the party's power effectively intervened in the political propaganda. With the advantages of numerous post offices and postal routes all over the country, the post has successfully spread the party newspapers and magazines to the grassroots, imperceptibly completed the education of political identity for the people, and the political function of the post strengthened unprecedentedly. During the period of the first-five-year plan, Beijing post actively improved its production, and exceeded the targets of the first-five-year plan by promoting advanced production experiences, strengthening rationalization proposals, and carrying out the movement of advanced producers.

From 1949 to 1957, under the leadership of the Chinese Communist Party, Beijing post office system radiated great development potential and played an important social function. It not only helped the enterprise to turn losses into profits, but also helped the recovery and development of the national economy and the consolidation of the new regime.