2004年,在世界杯短池賽(sai)俄羅斯站200米混(hun)合泳中,劉子歌獲得金(jin)牌。同年,隨著教練(lian)金(jin)煒轉(zhuan)會到(dao)上(shang)海(hai),成為上(shang)海(hai)寶山體育局寶山游(you)泳學校的一名(ming)學生。?
2005年,劉子(zi)歌進(jin)入(ru)上海游泳(yong)隊。?
2007年,進入中國國家隊(dui)。
2008年4月,在全(quan)國游泳(yong)冠軍(jun)賽(sai)(sai)暨(ji)奧運會(hui)選拔(ba)賽(sai)(sai)中獲(huo)得(de)女子(zi)200米(mi)蝶泳(yong)冠軍(jun),并(bing)(bing)取得(de)北京(jing)奧運會(hui)參(can)賽(sai)(sai)資格;8月14日,劉子(zi)歌在北京(jing)奧運會(hui)女子(zi)200蝶泳(yong)比賽(sai)(sai)中,以2分04秒18獲(huo)得(de)金牌,并(bing)(bing)打破了世界紀錄。
2009年(nian)4月(yue)(yue)(yue),在(zai)(zai)全國游泳(yong)(yong)(yong)冠(guan)軍(jun)賽(sai)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)獲得(de)(de)(de)銀(yin)牌(pai),7月(yue)(yue)(yue),在(zai)(zai)羅馬世(shi)(shi)錦賽(sai)獲得(de)(de)(de)200蝶(die)(die)泳(yong)(yong)(yong)亞(ya)軍(jun),10月(yue)(yue)(yue),在(zai)(zai)十一(yi)(yi)運(yun)會上,以(yi)56秒07獲得(de)(de)(de)100米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)冠(guan)軍(jun),并(bing)打破亞(ya)洲紀(ji)錄(lu);以(yi)2分(fen)01秒81獲得(de)(de)(de)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)冠(guan)軍(jun),超過(guo)了澳大利亞(ya)選手斯奇普保持的(de)2分(fen)03秒41的(de)世(shi)(shi)界紀(ji)錄(lu);還與隊友合作(zuo)(zuo)獲得(de)(de)(de)女(nv)(nv)子(zi)(zi)4×100米(mi)(mi)混(hun)合泳(yong)(yong)(yong)金牌(pai)。11月(yue)(yue)(yue),在(zai)(zai)世(shi)(shi)界杯(bei)短池游泳(yong)(yong)(yong)系列賽(sai)斯德(de)哥爾摩站,以(yi)2分(fen)02秒50獲得(de)(de)(de)金牌(pai),并(bing)打破了世(shi)(shi)界紀(ji)錄(lu)。在(zai)(zai)國際泳(yong)(yong)(yong)聯短池游泳(yong)(yong)(yong)世(shi)(shi)界杯(bei)賽(sai)柏林站,獲得(de)(de)(de)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)冠(guan)軍(jun),以(yi)2分(fen)00秒78打破世(shi)(shi)界紀(ji)錄(lu)。同年(nian)12月(yue)(yue)(yue),獲得(de)(de)(de)第(di)五屆東亞(ya)運(yun)動會女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)金牌(pai)、亞(ya)洲游泳(yong)(yong)(yong)錦標賽(sai)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)金牌(pai)。2010年(nian)2月(yue)(yue)(yue),在(zai)(zai)短池游泳(yong)(yong)(yong)世(shi)(shi)錦賽(sai)女(nv)(nv)子(zi)(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)決(jue)賽(sai)中,劉子(zi)(zi)歌開始(shi)150米(mi)(mi)一(yi)(yi)路領先,但后勁不足,最(zui)終以(yi)2分(fen)04秒78僅列第(di)五。在(zai)(zai)女(nv)(nv)子(zi)(zi)4×100米(mi)(mi)混(hun)合泳(yong)(yong)(yong)接(jie)力(li)中,與隊友合作(zuo)(zuo)獲得(de)(de)(de)金牌(pai)。
2011年(nian)4月(yue),在(zai)全國游(you)泳(yong)(yong)(yong)(yong)冠軍(jun)賽,獲(huo)得(de)女(nv)(nv)子50米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)第(di)(di)五(wu)名(ming)(ming)(ming)、100米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)冠軍(jun)、200米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)冠軍(jun)。同(tong)(tong)年(nian)11月(yue),在(zai)短(duan)(duan)(duan)池世界杯(bei)北(bei)(bei)京站(zhan)女(nv)(nv)子100米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)獲(huo)得(de)第(di)(di)四(si)名(ming)(ming)(ming)、女(nv)(nv)子200米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)第(di)(di)四(si)名(ming)(ming)(ming)。同(tong)(tong)年(nian)8月(yue),在(zai)倫敦奧運會女(nv)(nv)子200米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)僅獲(huo)得(de)第(di)(di)八名(ming)(ming)(ming)。同(tong)(tong)年(nian)11月(yue),短(duan)(duan)(duan)池游(you)泳(yong)(yong)(yong)(yong)世界杯(bei)系列賽北(bei)(bei)京站(zhan)獲(huo)得(de)女(nv)(nv)子100米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)第(di)(di)五(wu)名(ming)(ming)(ming)、女(nv)(nv)子200米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)第(di)(di)三名(ming)(ming)(ming);同(tong)(tong)年(nian)12月(yue),世界短(duan)(duan)(duan)池游(you)泳(yong)(yong)(yong)(yong)錦標賽獲(huo)得(de)女(nv)(nv)子100米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)獲(huo)得(de)第(di)(di)二名(ming)(ming)(ming)、女(nv)(nv)子200米(mi)(mi)(mi)(mi)蝶(die)(die)(die)泳(yong)(yong)(yong)(yong)第(di)(di)四(si)名(ming)(ming)(ming)。
2013年,全國游泳(yong)冠軍賽女子200米蝶泳(yong)獲得(de)第(di)二名;同年8月(yue),世(shi)界游泳(yong)錦標(biao)賽女子200米蝶泳(yong)獲得(de)冠軍。