The random-fuzzy principle for the statistics of experimental data of foundation geotechnical test is presented by combining fuzzy mathematics with information theory.The corresponding formulae are deduced.The random statistical formulae are proved to be a special case of the deduced formulae.A calculated example testifies the rightness and applicability of the suggested method in this(paper.)The calculated results shown that the random-fuzzy statistical method is more realistic and better than the conventi...