There have been as yet no definite opinions as to what rate of strain should be used to obtain the undrained shearing strength of soil in a triaxial compression test, though the specified rate of strain was stated in the book published by Japan Society of Soil and Foundation Engineering, as 1%/min. However, as this rate of strain was specified recently, what difference between the results of triaxial compression test cariied out hitherto at other rates of strain and those obtanied at the specified rate of strain existed was described in this report. In conclusion was it clear as has been stated by other investigators that there was a little difference in the undrained strength and, moreover, the pore-water pressure at failure which were tested in the range extending from 0.1%/min to 10%/min, which resulted in decreasing of the angle of internal friction by 3 degrees as the rate of strain increased. Other soil properties in view of the strength characteristics with several rates of strain were stated.