Abstract：Some difficulties are found on the current methods to determine rock parameters. By combination of intactness index of rock mass with microcrack density，the analytical method of rock mass parameters is obtain on the micromechanical damage theory. The Taylor method and the generalized self-consistent method are used combining with practical examples and some statistics；and the method is modified according to calculation results combining with BQ method when the intactness index of rock mass is less than 0.5. The results show that it is reasonable and useful in avoiding artificial influence and experience differences of traditional methods.
