In order to analyze the probabilistic property of ice load

the probability distribution of the river ice compressive strength is important.The small sample of the river ice compressive strength is common in engineering for reducing the experiment cost

so its probability distribution is determined hardly for its small sample size.The normal information spread method is applied to the determination of the probability distribution of small sample of the compressive strength and the calculating method of its probability distribution is obtained.The method has been verified by K-S test with experimental data of the river ice compressive strength.It is indicated that the probability distribution of small sample of the compressive strength by the method in this paper is closer to real distribution than the distribution by classical calculating method.