Abstract:The technology of the segmented slug tests in a single borehole was developed based on the theory of slug test and the expression of hydraulic conductivity tensor. A set of test equipment,comprising of a multi- functional probe,a seal valve,an operating screen and a pneumatic pump,etc. and capable of capturing the borehole image,the fracture orientation,the water pressure and the temperature and transmitting the data to the data collection system on the ground was developed. A program was written to calculate the hydraulic conductivity of fissures and the hydraulic conductivity tensor of rock mass,and specific water storage in fractured rock based on the data of single-borehole slug tests. A single-borehole slug test was carried out in site and the corresponding methods for determining the hydraulic conductivity tensor were described in detail.