Abstract: In consideration of difference in consolidated stress,loading mode and drainage between ordinary lab triaxial tests and in situ situation,this papers presents expressions,which take in situ actual consolidated stress and loading mode into account,to calculate in situ strength indexes for total stress analysis.Based on the derived expressions,a comparison between in situ and lab tests are made, and the applicability of lab test results to in situ soils is discussed.Special attention has been paid to consolidated undrained,partly consolidated undrained and unconsolidated partly drained shears.