Abstract: Xinggu Block 7 is the main block of Xinglongtai buried hill reservoir in Liaohe Oilfield. It is determined to explore with the way of controlling with vertical well and overlaying between different layers, crisscrossing in segment, whole exploration and bottom injection in highly deviated wells horizontal herringbone wells. The drilling and completion quality of horizontal well would directly influence the continual productivity in this block. This paper introduced the basic geology information of Xinggu Block 7 briefly, and analyzed the technical difficulties of drilling and completion in this block with an example of engineering design of horizontal well, then proposed the specific construction technique of drilling, finally gave emphasis on discussion of selective completion technique in horizontal well on the basis of liquid expandable packer. The successful application of selective completion technique not only solve the simplex completion method of horizontal well in Liaohe Oilfied, but also give references for exploring deep buried hill reservoir with horizontal well technique for other oilfields.