A carbothermic reduction peocess was used to achieve the simultaneous separation and recovery of lead, tin and zinc in zinc oxide dust. The effects of pretreatment to remove fluorine, chlorine and sulfur (Na2CO3-alkali washing and calcination) and adding additives (CaO and bentonite) on the volatilization rate of lead and tin in carbothermic reduction process were investigated. The results show that the volatilization rate of lead and tin were 78.58% and 95.97% respectively when the dust was not pretreated and the conditions were the temperature of 1300℃, the reductant dosage of 14.04% and the holding time of 120min. Under the same conditions, alkali washing and calcination could reduce the volatilization rate of lead and tin. After alkali washing, the volatilization rate of lead and tin reduced to 12.97% and 16.99% respectively. After calcination, the volatilization rate of lead and tin reduced to 30.46% and 57.83% respectively. Increasing the dosage of CaO is beneficial to reduce the volatilization rate of lead and tin. When the dosage of CaO was 5%, the volatilization rate of lead and tin drops to 32.16% and 57.7% respectively. Increasing the dosage of bentonite promotes the volatilization of lead, but has no obvious effect on volatilization of tin. When the dosage of bentonite was 5%, the volatilization rate of lead and tin drops to 37.44% and 83.25% respectively. Using this process, lead-tin alloy (Pb＞70%，Sn＞5%) and crude zinc (Zn＞63%，Pb＞9%) are finally obtained at the same time.