Abstract: How to recycling open-pit boundary remaining hanging wall ore is currently one main mining problem of open-pit mine into underground mine，in order to solve this problems，this paper discusses pillarless sublevel caving method for recycling of BiliheⅡ ore belt open-pit boundary remaining hanging wall ore of Sunid Jinxi Gold Mining Co.，Ltd.，it mainly discusses how to form overburden of pillarless sublevel caving method to recycling hanging wall ore.The method of forming overburden formation has some certain reference value for open-pit mine into underground mine.