The　air　forced　convection　is　utilized　to　cool　foods　in　frost-free　refrigerator,　and　it　offers　uniform　temperature　field　and　the　fast　cooling　rate.　But　the　air　forced　convection　also　accelerates　the　water　evaporation　from　foods　surface,　which　leads　to　foods　dehydration.　Numerical　model　of　water　evaporation　process　inside　refrigerating　compartment　was　validated　by　experimental　results　including　the　evaporated　water　mass,　air　temperature　and　relative　humidity　during　compressor　on　/off　cycle.　The　air　supply　modes　have　effects　on　velocity　and　temperature　fields　inside　refrigerating　compartment,　and　three　air　supply　modes　were　compared:　annularly　blowing　air　(ABA)　supply,　upward　blowing　air　(UBA)　supply　and　forward　blowing　air　(FBA)　supply　modes.　The　results　show　that　the　water　evaporation　rate　during　compressor-on　cycle　is　20　times　of　that　during　compressor-off　cycle.　The　effect　of　air　velocity　on　water　evaporation　process　is　greater　than　that　of　vapor　partial　pressure　difference.　The　water　evaporation　rate　for　FBA　supply　mode　is　the　largest　due　to　its　highest　air　velocity.　The　water　evaporation　rate　of　ABA　supply　mode　is　the　least　because　of　both　its　smaller　air　velocity　and　vapor　partial　pressure　difference,　and　it　is　the　best　mode　to　decrease　water　loss.　©　2020