In seasonal frozen soil region，the engineering geological properties of loess-like soil will be deteriorated after freeze-thaw cycles． Through the freeze-thaw cycle experiment of remolded loess-like soil，under different freezing temperatures，the authors carried out freeze-thaw cycle tests for 3 times and 20 times，respectively． With mercury intrusion porosimetry and granulometric analysis，from the micro-structure，the authors studied the law that freeze-thaw cycle times and frozen temperature effect on the variation of microscopic pore of loesslike soil． This result can provide theoretical basis for comprehensive treatment of problems in the construction of the project in seasonal frozen loess-like soil region．