A new rotary penetration apparatus, which was developed by Xi’an University of Technology, is verified, and the tests on Xi’an loess samples with five different dry densities and four water contents are done using the apparatus. The test results show that the probe resistance and torque increase with dry density increasing in same water content condition at a certain depth of 5 m, meanwhile the probe resistance and torque drop with increasing of water content in same dry density condition. The result will provide the basis for determinating the soil physical and mechanical properties through the rotary penetration test.