In　this　paper,　the　effects　of　water-cement　ratio,　air-entraining　agent　type,　and　air　content　on　the　pore　characteristic　parameters　of　hardened　concrete　were　investigated　through　an　extensive　series　of　experimental　studies.　First　of　all,　according　to　different　water-cement　ratios,　air-entraining　agent　types,　and　air　contents,　the　correlation　between　the　concrete　pore　spacing　factor　and　the　frost　resistance　durability　factor　was　revealed　by　using　the　automatic　analysis　and　testing　instrument　for　the　pore　system　of　hardened　concrete.　Then,　the　decision　tree　method　was　utilized　to　propose　specific　pore　spacing　factors　for　different　concrete　scenarios,　including　the　non-air-entrained　concrete,　air-entrained　concrete,　concrete　with　unqualified　frost　resistance,　and　concrete　with　qualified　frost　resistance.　In　cases　where　the　pore　spacing　factor　measurement　fell　within　an　ambiguous　range,　the　classification　was　further　refined　according　to　the　water-cement　ratio.　On　that　basis,　the　comprehensive　range　of　pore　spacing　factors　for　the　concrete　with　a　qualified　frost　resistance　was　determined.　Finally,　the　post-evaluation　method　and　standard　procedure　for　assessing　the　frost　resistance　of　concrete　entities　based　on　pore　spacing　factor　and　water-cement　ratio　were　proposed　to　verify　whether　the　frost　resistance　of　concrete　buildings　meets　the　life　expectancy　requirements.　This　method　facilitates　the　evaluation　of　the　frost　resistance　quality　of　newly-built　concrete　projects,　as　well　as　the　investigation　and　monitoring　of　frost　resistance　in　existing　structures　during　service.　©　2023　Elsevier　Ltd