In　this　article,　MIL-101(Cr)　powder　material　was　successfully　prepared　by　hydrothermal　synthesis　and　combined　with　different　mass　fractions　of　CaCl2　by　immersion　method　to　obtain　MIL-101(Cr)/CaCl2　composite　materials.　The　physical　properties　of　the　adsorbent　were　determined　by　X-ray　powder　diffraction,　N-2　adsorption/desorption　isotherm,　TGA　and　FTIR.　The　water　vapor　adsorption　performance　of　MOFs　was　tested　by　a　gravimetric　instrument　to　analyze　the　underlying　mechanism.　Results　indicated　that　the　specific　surface　area,　total　pore　volume,　and　pore　size　distribution　of　micropores　and　mesopores　of　MIL-101(Cr)/CaCl2　composites　decreased　with　increasing　CaCl2　content.　When　P/P-0=　0.9,　the　water　vapor　equilibrium　adsorption　capacities　of　MIL-101(Cr),　MIL-101(Cr)/CaCl2-10%,　MIL-101(Cr)/CaCl2-20%,　and　MIL-101(Cr)/CaCl2-30%　were　1.05,　0.88,　1.13,　and　1.35　g/g,　respectively.　MIL-101(Cr)/CaCl2-30%　agglomerated　after　water　absorption,　so　MIL-101(Cr)/CaCl2-20%　was　selected　as　the　final　experimental　material.　The　water　vapor　adsorption　heat　of　MIL-101(Cr)/CaCl2-20%　was　42-58　kJ/mol,　which　is　close　to　the　evaporation　enthalpy　of　water　(44　kJ/mol　at　25　degrees　C).　The　analysis　of　the　adsorption　kinetics　showed　the　relatively　uniform　adsorption　rate　of　MIL-101(Cr)/CaCl2-20%.　Overall,　MIL-101(Cr)/CaCl2-20%　exhibited　superior　water　vapor　adsorption　performance　and　have　great　potential　for　application　to　adsorption　heat　pumps.