Abstract: The intelligent drillhole optical imager is employed to analyze the fracture of drill holes. Based on the model for fracture materials, change of permeability tensors can be got by calculating the fracture. Influential factors and errors are aroused when the permeability tensors are characterized. The influence of statistical parameters on the permeability tensors is analyzed. Some methods for reducing the errors are proposed. The method is used in the project of Huangdao Water-Sealed Underground Oil Tank, and it has special superiority in the analysis of permeability tensors and is practical.