Portable drill has been widely used in geology and engineering exploration, in order to further expand its application scope and advocate green exploration, in Wangshiling cement limestone ore exploration of Dong’an County, the samples were obtained by using ZY-25 type portable drill by drilling instead of trenching with good effect. The practical application shows that under the conditions of simple mining area structure, gentle and stable strata occurrence, large thickness of ore body with high and uniform content of useful mineral components and low content of harmful components, it is feasible to use portable drill for sampling by drilling instead of trenching.