Abstract: A leaching experiment with environment-friendly Jinchan agents was adopted to B.Phatem carbonate type gold ore in Bak-ou county,Luang Pracang province of laos.The results showed that under the condition of grinding fineness of -0.074mm account more then 90%,pulp concentration 40%,lime dosage 3kg/t,pretreatment time with alkaLi 2h,dosage of Jinchan agent 600g/t,leaching time 24h,the gold leaching rate reached to 96.40%.Contrast to cyanide leaching process,gold leaching rate with Jinchan increase 1.4%,dosage amount reduce 200g/t,leaching time shroten more than 12h.Leaching toxicity analysis of the tailings was studied.The amount of cyanide,lead,zinc,arsenic in the tailings was within the national standard limit.So,Leaching tailings can directly discharge,don’t need detoxification treatment.Economic comparative analysis showed that using Jinchan agents can reduce production cost of 3.93 million yuan a year.