2004年,在世(shi)界杯短池賽俄(e)羅(luo)斯(si)站200米混合泳中,劉子歌(ge)獲(huo)得金牌。同年,隨著教練(lian)金煒(wei)轉(zhuan)會到(dao)上海,成(cheng)為上海寶(bao)山體育局寶(bao)山游泳學(xue)(xue)校的一名學(xue)(xue)生。?
2005年,劉(liu)子歌進入上(shang)海游泳隊。?
2007年,進入中國國家隊。
2008年(nian)4月(yue),在全國游泳冠(guan)軍賽(sai)暨奧(ao)運會(hui)選拔賽(sai)中獲(huo)得女子200米蝶泳冠(guan)軍,并(bing)取得北京(jing)奧(ao)運會(hui)參賽(sai)資格;8月(yue)14日,劉子歌(ge)在北京(jing)奧(ao)運會(hui)女子200蝶泳比(bi)賽(sai)中,以2分04秒18獲(huo)得金牌(pai),并(bing)打(da)破了世界紀錄。
2009年(nian)4月(yue),在(zai)全國(guo)游(you)(you)泳(yong)(yong)(yong)(yong)冠(guan)軍(jun)(jun)賽(sai)(sai)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)獲得(de)(de)銀牌(pai),7月(yue),在(zai)羅馬世錦賽(sai)(sai)獲得(de)(de)200蝶(die)(die)泳(yong)(yong)(yong)(yong)亞(ya)(ya)(ya)(ya)軍(jun)(jun),10月(yue),在(zai)十一(yi)運會上,以56秒(miao)(miao)07獲得(de)(de)100米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)冠(guan)軍(jun)(jun),并打破(po)(po)亞(ya)(ya)(ya)(ya)洲紀(ji)錄;以2分(fen)01秒(miao)(miao)81獲得(de)(de)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)冠(guan)軍(jun)(jun),超過了澳(ao)大利(li)亞(ya)(ya)(ya)(ya)選手斯奇普(pu)保持(chi)的2分(fen)03秒(miao)(miao)41的世界(jie)紀(ji)錄;還與隊友合作獲得(de)(de)女(nv)(nv)子(zi)4×100米(mi)混合泳(yong)(yong)(yong)(yong)金(jin)(jin)牌(pai)。11月(yue),在(zai)世界(jie)杯(bei)短池(chi)游(you)(you)泳(yong)(yong)(yong)(yong)系列賽(sai)(sai)斯德哥爾摩(mo)站(zhan),以2分(fen)02秒(miao)(miao)50獲得(de)(de)金(jin)(jin)牌(pai),并打破(po)(po)了世界(jie)紀(ji)錄。在(zai)國(guo)際泳(yong)(yong)(yong)(yong)聯短池(chi)游(you)(you)泳(yong)(yong)(yong)(yong)世界(jie)杯(bei)賽(sai)(sai)柏(bo)林站(zhan),獲得(de)(de)女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)冠(guan)軍(jun)(jun),以2分(fen)00秒(miao)(miao)78打破(po)(po)世界(jie)紀(ji)錄。同年(nian)12月(yue),獲得(de)(de)第五屆東亞(ya)(ya)(ya)(ya)運動會女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)金(jin)(jin)牌(pai)、亞(ya)(ya)(ya)(ya)洲游(you)(you)泳(yong)(yong)(yong)(yong)錦標賽(sai)(sai)女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)金(jin)(jin)牌(pai)。2010年(nian)2月(yue),在(zai)短池(chi)游(you)(you)泳(yong)(yong)(yong)(yong)世錦賽(sai)(sai)女(nv)(nv)子(zi)200米(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)決賽(sai)(sai)中,劉子(zi)歌開(kai)始150米(mi)一(yi)路(lu)領先,但(dan)后勁不足,最(zui)終以2分(fen)04秒(miao)(miao)78僅列第五。在(zai)女(nv)(nv)子(zi)4×100米(mi)混合泳(yong)(yong)(yong)(yong)接(jie)力中,與隊友合作獲得(de)(de)金(jin)(jin)牌(pai)。
2011年4月(yue)(yue),在全國游泳(yong)(yong)(yong)(yong)(yong)冠軍(jun)賽(sai),獲得(de)(de)女(nv)(nv)(nv)(nv)子(zi)50米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)第(di)(di)(di)(di)五(wu)名、100米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)冠軍(jun)、200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)冠軍(jun)。同年11月(yue)(yue),在短(duan)(duan)池世界杯北京站女(nv)(nv)(nv)(nv)子(zi)100米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)獲得(de)(de)第(di)(di)(di)(di)四(si)(si)名、女(nv)(nv)(nv)(nv)子(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)第(di)(di)(di)(di)四(si)(si)名。同年8月(yue)(yue),在倫敦奧運會女(nv)(nv)(nv)(nv)子(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)僅獲得(de)(de)第(di)(di)(di)(di)八名。同年11月(yue)(yue),短(duan)(duan)池游泳(yong)(yong)(yong)(yong)(yong)世界杯系列賽(sai)北京站獲得(de)(de)女(nv)(nv)(nv)(nv)子(zi)100米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)第(di)(di)(di)(di)五(wu)名、女(nv)(nv)(nv)(nv)子(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)第(di)(di)(di)(di)三名;同年12月(yue)(yue),世界短(duan)(duan)池游泳(yong)(yong)(yong)(yong)(yong)錦標賽(sai)獲得(de)(de)女(nv)(nv)(nv)(nv)子(zi)100米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)獲得(de)(de)第(di)(di)(di)(di)二名、女(nv)(nv)(nv)(nv)子(zi)200米(mi)(mi)蝶(die)(die)泳(yong)(yong)(yong)(yong)(yong)第(di)(di)(di)(di)四(si)(si)名。
2013年,全國游泳冠軍賽女(nv)子(zi)200米蝶泳獲得(de)第二名;同(tong)年8月,世界游泳錦標賽女(nv)子(zi)200米蝶泳獲得(de)冠軍。