1949年开国大典前夕，晋察冀军区抗敌剧社舞美队队长田震英（潘粤明 饰）接到上级命令，为开国大典布置天安门城楼。破旧颓败的旧城楼，散发着臭气的金水河，长满杂草的广场，都必须在十月一号之前改换新颜。此时，离开国大典只有28天的时间，天安门附近一片热火朝天的景象，无数的革命军民都在为开国大典夜以继日的工作，田震英引领舞美队也开始了重新装修布置天安门城楼的准备工作。可是装修才开始就遇到困难，布置城楼的红布居然严重缺货。任务依旧艰巨，时间越来越近，为了开国大典能够顺利进行，为了完成任务见到毛主席，舞美队排除万难，终于圆满完成了天安门城楼的布置任务。

It's 1949 and Tiananmen Square is a mess. Overgrown with weeds and thoroughly dilapidated it looks like hell, but it's where Chairman Mao wants to hold the Founding Ceremony for the People's Republic of China on October 1, 1949. And so TIAN AN MEN recounts the heroism, the struggle and the sacrifices of a People's Liberation Army unit as they...clean up and re-decorate the Tiananmen Gate? (Description by Subway Cinema)