ＣＺ－３Ａ系列运载火箭，是指由长征三号甲（ＣＺ－３Ａ）及其发展型长征三号乙（ＣＺ－３Ｂ）和长征三号丙（ＣＺ－３Ｃ）３种火箭组成的大型火箭群体。主要用于发射地球同步转移轨道（ＧＴＯ）有效载荷，也可用于近地轨道（ＬＥＯ）、太阳同步轨道（ＳＳＯ）以及飞往月球与火星等深空探测有效载荷的发射。该系列火箭是目前中国运载能力最大的系列火箭，也是中国跨世纪的商业应用发射的大型主力火箭。 CZ-3A series carrier rocket refers to a large rocket group composed of CZ-3A and its developed CZ-3B and CZ-3C rocket of the Long March III . It is mainly used for launching the GTO payload and also for the launch of LEO, SSO and deep space exploration payloads such as the Moon and Mars. This series of rockets is currently the largest series of rocket launchers in China and is also the main rocket launched by China’s cross-century commercial applications.