筹建中央特科“四·一二”事变后的上海，敌情特别复杂。中共中央要站稳脚跟，打击敌人，发展革命力量，就必须在改善秘密工作条件的同时，花大力气做好情报、保卫工作，以保障党组织特别是中央机关的安全。这些都离不开经周恩来亲手开辟的党的情报保卫组织——中央特科的特殊 After the preparation for the establishment of Shanghai after the “April 12” incident by Central Special Branch, the enemy’s situation is particularly complicated. To gain a firm foothold, combat the enemy and develop the revolutionary forces, the CPC Central Committee must make every effort to improve intelligence and safeguard its work while improving the conditions of its secret work so as to safeguard the security of party organizations, especially the central government. These are inseparable from the party’s intelligence protection organization opened by Zhou Enlai - the special of the Central Special Branch