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  The frequency,spacing and trace length of rock mass discontinuities appear to follow a negative exponential distribution.However,in some cases this distribution has limitations.To overcome this,it is necessary to choose a target distribution which is flexible enough to simulate the spacing and trace length of the discontinuities.The paper shows how the two parameter negative exponential(TPNE) distributions can meet the requirements.An improved constitutive equation of rock mass based on this new distribution has been determined from which a new method to calculate rock mass elastic modulus(Em) is proposed,taking into account the rock mass anisotropy.It was found that the geo-stresses influence Em in two ways:it varies with changes in the orientation of the geo-stress and with the size of geostress. The work is illustrated by a case study on the abutment slope of the 295 m high arched dam of the Xiao wan hydroelectric power station in Yunnan province, Southwest of China.……