2004年,在世界(jie)杯短(duan)池賽俄羅斯站(zhan)200米混合泳(yong)中,劉子歌(ge)獲得金牌。同年,隨(sui)著教練金煒轉會到上海(hai),成為上海(hai)寶山體(ti)育(yu)局寶山游泳(yong)學校(xiao)的一(yi)名學生。?
2005年,劉子歌(ge)進入(ru)上(shang)海游泳隊。?
2007年,進入中國(guo)(guo)國(guo)(guo)家隊。
2008年4月(yue),在全國(guo)游泳冠(guan)軍賽暨奧(ao)運(yun)(yun)會選拔賽中獲得(de)(de)女(nv)子200米蝶泳冠(guan)軍,并取得(de)(de)北京奧(ao)運(yun)(yun)會參賽資格(ge);8月(yue)14日,劉子歌在北京奧(ao)運(yun)(yun)會女(nv)子200蝶泳比賽中,以2分04秒(miao)18獲得(de)(de)金牌,并打破了世界(jie)紀錄。
2009年4月(yue)(yue)(yue),在(zai)全國游(you)泳(yong)(yong)(yong)冠軍(jun)賽(sai)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)獲(huo)(huo)(huo)得(de)(de)銀(yin)牌(pai),7月(yue)(yue)(yue),在(zai)羅馬世(shi)(shi)(shi)錦(jin)賽(sai)獲(huo)(huo)(huo)得(de)(de)200蝶(die)泳(yong)(yong)(yong)亞軍(jun),10月(yue)(yue)(yue),在(zai)十(shi)一運會上(shang),以(yi)56秒07獲(huo)(huo)(huo)得(de)(de)100米(mi)(mi)蝶(die)泳(yong)(yong)(yong)冠軍(jun),并打(da)破亞洲(zhou)紀錄(lu);以(yi)2分(fen)(fen)01秒81獲(huo)(huo)(huo)得(de)(de)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)冠軍(jun),超過了澳大利亞選(xuan)手斯奇普保持的2分(fen)(fen)03秒41的世(shi)(shi)(shi)界紀錄(lu);還(huan)與隊(dui)友合(he)作獲(huo)(huo)(huo)得(de)(de)女(nv)(nv)子(zi)(zi)4×100米(mi)(mi)混合(he)泳(yong)(yong)(yong)金(jin)牌(pai)。11月(yue)(yue)(yue),在(zai)世(shi)(shi)(shi)界杯短(duan)池(chi)(chi)游(you)泳(yong)(yong)(yong)系列賽(sai)斯德(de)哥(ge)爾摩站,以(yi)2分(fen)(fen)02秒50獲(huo)(huo)(huo)得(de)(de)金(jin)牌(pai),并打(da)破了世(shi)(shi)(shi)界紀錄(lu)。在(zai)國際泳(yong)(yong)(yong)聯短(duan)池(chi)(chi)游(you)泳(yong)(yong)(yong)世(shi)(shi)(shi)界杯賽(sai)柏林(lin)站,獲(huo)(huo)(huo)得(de)(de)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)冠軍(jun),以(yi)2分(fen)(fen)00秒78打(da)破世(shi)(shi)(shi)界紀錄(lu)。同(tong)年12月(yue)(yue)(yue),獲(huo)(huo)(huo)得(de)(de)第五屆東亞運動會女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)金(jin)牌(pai)、亞洲(zhou)游(you)泳(yong)(yong)(yong)錦(jin)標(biao)賽(sai)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)金(jin)牌(pai)。2010年2月(yue)(yue)(yue),在(zai)短(duan)池(chi)(chi)游(you)泳(yong)(yong)(yong)世(shi)(shi)(shi)錦(jin)賽(sai)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)泳(yong)(yong)(yong)決(jue)賽(sai)中,劉(liu)子(zi)(zi)歌(ge)開始150米(mi)(mi)一路領先(xian),但后勁不足,最終(zhong)以(yi)2分(fen)(fen)04秒78僅列第五。在(zai)女(nv)(nv)子(zi)(zi)4×100米(mi)(mi)混合(he)泳(yong)(yong)(yong)接力中,與隊(dui)友合(he)作獲(huo)(huo)(huo)得(de)(de)金(jin)牌(pai)。
2011年(nian)4月(yue),在(zai)(zai)全國游泳(yong)(yong)冠軍(jun)賽,獲(huo)(huo)得(de)女(nv)(nv)子(zi)50米(mi)蝶(die)(die)泳(yong)(yong)第(di)五(wu)名(ming)(ming)(ming)、100米(mi)蝶(die)(die)泳(yong)(yong)冠軍(jun)、200米(mi)蝶(die)(die)泳(yong)(yong)冠軍(jun)。同(tong)年(nian)11月(yue),在(zai)(zai)短(duan)池世(shi)界杯北京(jing)站(zhan)女(nv)(nv)子(zi)100米(mi)蝶(die)(die)泳(yong)(yong)獲(huo)(huo)得(de)第(di)四名(ming)(ming)(ming)、女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)第(di)四名(ming)(ming)(ming)。同(tong)年(nian)8月(yue),在(zai)(zai)倫敦奧運會女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)僅獲(huo)(huo)得(de)第(di)八名(ming)(ming)(ming)。同(tong)年(nian)11月(yue),短(duan)池游泳(yong)(yong)世(shi)界杯系列賽北京(jing)站(zhan)獲(huo)(huo)得(de)女(nv)(nv)子(zi)100米(mi)蝶(die)(die)泳(yong)(yong)第(di)五(wu)名(ming)(ming)(ming)、女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)第(di)三名(ming)(ming)(ming);同(tong)年(nian)12月(yue),世(shi)界短(duan)池游泳(yong)(yong)錦(jin)標賽獲(huo)(huo)得(de)女(nv)(nv)子(zi)100米(mi)蝶(die)(die)泳(yong)(yong)獲(huo)(huo)得(de)第(di)二名(ming)(ming)(ming)、女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)第(di)四名(ming)(ming)(ming)。
2013年(nian),全國游(you)泳冠軍(jun)賽女子(zi)200米蝶泳獲得(de)第(di)二名;同年(nian)8月,世界游(you)泳錦(jin)標賽女子(zi)200米蝶泳獲得(de)冠軍(jun)。