The zoning of karst reservoir in vertical direction is the objective manifestation of the uneven development of karst in the vertical direction.According to the theory of modern karst, through the statistical analysis of a large number of logging data, on the basis of the development of the fracturecavity system, the mode of groundwater movement and the way of karstic action, the vertical structure of karst reservoir was classified into four karst zones namely, epikarst zone, vertical percolatecorrosion zone, runoff corrosion zone, and phreatic corrosion zone. The index system of the welllogging response and karst formation on the vertical zone division of the Ordovician karst reservoir in Tahe oilfield was established. The index of welllogging response includes natural gamma, resistivity, well diameter and so on. Karst genetic indicators include groundwater runoff, the types of karstification, the filling characteristics and karst individual form. According to the division standard, the development characteristics of vertical zones in the Ordovician karst reservoirs in Tahe oilfield were analyzed statistically. And the vertical zoning development characteristics of karst reservoirs in different landform areas were analyzed. Analysis shows that epikarst zone with large and mediumsized pores, logging shows Gaugama, low resistance; and semi filling (or not filling) when logging is Bagama, low resistance. The vertical percolatecorrosion zone is characterized by high angle dissolution and small corrosion holes, and the well log is Bagama. The runoff corrosion zone with more large caves is shown Gaugama and low resistance. The phreatic corrosion zone with weak karstification is shown low gama and high resistance.