Resilient modulus of some subgrade soils were tested using repeated loading triaxial test method.The relationships between resilient modulus and stress level,water content,degree of compaction were analysed.It is shown that both deviator stress and confining stress greatly affect resilient modulus,and the influence of water content is great.Degree of compaction is also an important factor affecting resilient modulus.Base on test result,for testing and valuing standard for resilient modulus of subgrade soils following conditions should be considered: actual stress level;annual weighted-mean resilient modulus is calculated based on Miner's linear damage concept to reflect the seasonal variations in resilient modulus of subgrade soils and the corresponding relative damage;degree of compaction should be taten based on actual level in construction site or 95% can be taken.