The heterogeneity of hardfill is obvious, so it is of necessity to study its parameter’s statistical distribution. Take three hardfill projects with field tests’ data as research objects, the probability and statistical analysis have been done based on χ2 or K-S finite contrast method, and the recommended probability distribution models have been put forward：recommend normal distribution to fit the probability of density; recommend lognormal distribution to fit the probability of modulus of elasticity; recommend lognormal distribution to fit the probability of strength parameters; recommend β distribution to fit the probability of poisson ratio. Moreover, the correlation distance of hardfill dam is also discussed. Results are that the vertical correlation distance and the horizontal correlation distance are 0.5~2.0 m and 5~30 m, respectively.