Abstract：The rock failure due to freeze-thaw weathering is a main engineering problem which often occurs in the rock engineering in cold regions. The process of the rock failure due to freezing and thawing and the effect factors are systematically analyzed，also the mechanism of rock failure due to freezing and thawing is studied. The process of freezing and thawing failure of two types of rocks is studied by experiments；and two basic modes of rock deterioration are found；i. e.，the scaling mode and fracturing mode. In addition to providing reliable experimental foundation for studying the damage and fracture due to freezing and thawing，the uniaxial compression tests of two types of rocks subjected to different cycles of freezing and thawing were conducted in room temperature(about 20 ℃)；and the fitting relations of the uniaxial compressive strength and elastic modulus respectively with the cycles of freezing and thawing are formulated.
