2004年,在世界杯(bei)短池賽俄羅斯站200米混合泳(yong)中,劉子(zi)歌獲得金(jin)牌(pai)。同年,隨著教練金(jin)煒轉會(hui)到(dao)上海(hai),成為(wei)上海(hai)寶(bao)(bao)山(shan)(shan)體育局寶(bao)(bao)山(shan)(shan)游泳(yong)學(xue)(xue)校的一(yi)名學(xue)(xue)生。?
2005年,劉子歌(ge)進入上(shang)海(hai)游泳隊(dui)。?
2007年,進入(ru)中國(guo)國(guo)家隊。
2008年4月,在全國游泳(yong)冠軍賽暨奧(ao)運(yun)(yun)會(hui)選拔賽中獲得(de)(de)女子(zi)(zi)200米(mi)蝶(die)泳(yong)冠軍,并(bing)取得(de)(de)北京奧(ao)運(yun)(yun)會(hui)參賽資格;8月14日,劉子(zi)(zi)歌在北京奧(ao)運(yun)(yun)會(hui)女子(zi)(zi)200蝶(die)泳(yong)比賽中,以2分(fen)04秒18獲得(de)(de)金牌,并(bing)打破了世界紀錄(lu)。
2009年4月(yue)(yue),在(zai)全(quan)國(guo)游(you)泳(yong)(yong)(yong)冠軍(jun)賽200米(mi)蝶(die)(die)泳(yong)(yong)(yong)獲(huo)得(de)(de)銀牌(pai),7月(yue)(yue),在(zai)羅馬世(shi)錦(jin)賽獲(huo)得(de)(de)200蝶(die)(die)泳(yong)(yong)(yong)亞軍(jun),10月(yue)(yue),在(zai)十一(yi)運會(hui)上,以56秒(miao)07獲(huo)得(de)(de)100米(mi)蝶(die)(die)泳(yong)(yong)(yong)冠軍(jun),并打(da)(da)破亞洲紀錄(lu);以2分(fen)01秒(miao)81獲(huo)得(de)(de)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)冠軍(jun),超(chao)過了澳大利亞選手(shou)斯(si)奇普(pu)保持(chi)的2分(fen)03秒(miao)41的世(shi)界(jie)紀錄(lu);還與隊(dui)友合(he)作獲(huo)得(de)(de)女子(zi)(zi)(zi)4×100米(mi)混(hun)合(he)泳(yong)(yong)(yong)金(jin)(jin)(jin)牌(pai)。11月(yue)(yue),在(zai)世(shi)界(jie)杯短(duan)池(chi)游(you)泳(yong)(yong)(yong)系列賽斯(si)德(de)哥爾摩站(zhan),以2分(fen)02秒(miao)50獲(huo)得(de)(de)金(jin)(jin)(jin)牌(pai),并打(da)(da)破了世(shi)界(jie)紀錄(lu)。在(zai)國(guo)際泳(yong)(yong)(yong)聯短(duan)池(chi)游(you)泳(yong)(yong)(yong)世(shi)界(jie)杯賽柏林站(zhan),獲(huo)得(de)(de)女子(zi)(zi)(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)冠軍(jun),以2分(fen)00秒(miao)78打(da)(da)破世(shi)界(jie)紀錄(lu)。同年12月(yue)(yue),獲(huo)得(de)(de)第(di)五屆東亞運動會(hui)女子(zi)(zi)(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)金(jin)(jin)(jin)牌(pai)、亞洲游(you)泳(yong)(yong)(yong)錦(jin)標賽女子(zi)(zi)(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)金(jin)(jin)(jin)牌(pai)。2010年2月(yue)(yue),在(zai)短(duan)池(chi)游(you)泳(yong)(yong)(yong)世(shi)錦(jin)賽女子(zi)(zi)(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)決賽中,劉子(zi)(zi)(zi)歌開始150米(mi)一(yi)路領(ling)先,但后勁不足,最終以2分(fen)04秒(miao)78僅列第(di)五。在(zai)女子(zi)(zi)(zi)4×100米(mi)混(hun)合(he)泳(yong)(yong)(yong)接力中,與隊(dui)友合(he)作獲(huo)得(de)(de)金(jin)(jin)(jin)牌(pai)。
2011年(nian)4月(yue),在全國游(you)泳(yong)冠(guan)軍(jun)(jun)賽(sai),獲得(de)(de)女(nv)(nv)子(zi)(zi)(zi)(zi)50米(mi)(mi)(mi)(mi)蝶(die)泳(yong)第(di)(di)(di)(di)(di)五名(ming)(ming)(ming)、100米(mi)(mi)(mi)(mi)蝶(die)泳(yong)冠(guan)軍(jun)(jun)、200米(mi)(mi)(mi)(mi)蝶(die)泳(yong)冠(guan)軍(jun)(jun)。同(tong)年(nian)11月(yue),在短池世界(jie)杯北京(jing)站(zhan)女(nv)(nv)子(zi)(zi)(zi)(zi)100米(mi)(mi)(mi)(mi)蝶(die)泳(yong)獲得(de)(de)第(di)(di)(di)(di)(di)四(si)名(ming)(ming)(ming)、女(nv)(nv)子(zi)(zi)(zi)(zi)200米(mi)(mi)(mi)(mi)蝶(die)泳(yong)第(di)(di)(di)(di)(di)四(si)名(ming)(ming)(ming)。同(tong)年(nian)8月(yue),在倫敦奧運會女(nv)(nv)子(zi)(zi)(zi)(zi)200米(mi)(mi)(mi)(mi)蝶(die)泳(yong)僅(jin)獲得(de)(de)第(di)(di)(di)(di)(di)八(ba)名(ming)(ming)(ming)。同(tong)年(nian)11月(yue),短池游(you)泳(yong)世界(jie)杯系(xi)列賽(sai)北京(jing)站(zhan)獲得(de)(de)女(nv)(nv)子(zi)(zi)(zi)(zi)100米(mi)(mi)(mi)(mi)蝶(die)泳(yong)第(di)(di)(di)(di)(di)五名(ming)(ming)(ming)、女(nv)(nv)子(zi)(zi)(zi)(zi)200米(mi)(mi)(mi)(mi)蝶(die)泳(yong)第(di)(di)(di)(di)(di)三名(ming)(ming)(ming);同(tong)年(nian)12月(yue),世界(jie)短池游(you)泳(yong)錦標賽(sai)獲得(de)(de)女(nv)(nv)子(zi)(zi)(zi)(zi)100米(mi)(mi)(mi)(mi)蝶(die)泳(yong)獲得(de)(de)第(di)(di)(di)(di)(di)二名(ming)(ming)(ming)、女(nv)(nv)子(zi)(zi)(zi)(zi)200米(mi)(mi)(mi)(mi)蝶(die)泳(yong)第(di)(di)(di)(di)(di)四(si)名(ming)(ming)(ming)。
2013年,全國游(you)泳(yong)(yong)冠(guan)軍賽(sai)(sai)女子(zi)200米(mi)蝶泳(yong)(yong)獲得第(di)二名;同年8月,世界游(you)泳(yong)(yong)錦標(biao)賽(sai)(sai)女子(zi)200米(mi)蝶泳(yong)(yong)獲得冠(guan)軍。