Abstract: The probability characteristic values for degree of consolidation for sand-drained ground are calculated by the method of Monte C arlo simulation.The effect of coefficient of variation of uncertain parameters o n the probability characteristic of consolidation for sand-drained ground is st udied by the method of orthogonal experiment.The approximate method of pr obabil ity analysis of consolidation for sand-drained ground and its accuracy is resea rched.The formulas of expectation and variance of degree of consolidation for sa nd-drained ground are obtained.It is generalized from investigation that the d egree of consolidation of sand-drained ground is very sensitive to the uncertai nty in coefficient of horizontal consolidation.The approximate method of probab ility analysis of consolidation for sand-drained ground is brought forward,whi ch can only take into account the effect of uncertainty in coefficient of horizo ntal consolidation,whose error research further proves its practicability.The m ethod of probabilistic design for consolidation of sand-drained ground is provi ded,which connects probabilistic design to routine design with design coefficie nt.