Metal-organic　framework　(MOF)　offers　a　promising　solution　to　the　global　water　crisis　with　atmospheric　water　harvesting　(AWH).　However,　its　practical　application　is　limited　by　its　water　adsorption　performance　in　various　humidity　conditions.　In　this　work,　composited　MOFs　(CMOFs)　with　hygroscopic　salt　were　synthesized　by　a　one-　pot　hydrothermal　method　to　enhance　the　water　uptake,　and　the　effect　of　aluminum　sources　and　dispersants　was　investigated.　AlCl3　and　Al(NO3)(3)　were　efficient　aluminum　sources　that　showed　stable　water　adsorption　performance,　which　exhibited　excellent　water　adsorption　performance　with　a　water　adsorption　capacity　of　0.4　g　center　dot　g(-1)　at　20　%　RH　for　MOF-303.　The　crystal　structure　of　MOF-303　will　change　and　show　a　significantly　low　specific　surface　area　as　Al-2(SO4)(3)　is　used　as　the　aluminum　source,　and　the　water　adsorption　capacity　decreases　to　0.2　g　center　dot　g(-1)　at　20　%　RH　because　of　the　strong　binding　energy　(-7.196　eV)　between　SO42-　and　MOF-303.　Hygroscopic　salt　was　incorporated　in　MOF　successfully　via　the　one-pot　hydrothermal　synthesis　method,　the　composite　ratio　of　salt　was　0.1442,　0.1732,　and　0.1607　g　center　dot　g(-1)　in　MOF-303-LiOH,　MOF-303-NaOH,　and　MOF-303-Ca(OH)(2).　The　new　chemical　state　of　chlorine　and　sodium　elements　demonstrate　that　the　hygroscopic　salt　was　adsorbed/trapped　by　the　MOF　structure.　MOF-303-NaOH　showed　a　stable　water　adsorption　capacity　of　0.22　g　center　dot　g(-1)　at　30　%　RH　and　significantly　enhanced　water　adsorption　capacity　of　up　to　2.05　g　center　dot　g(-1)　at　95　%　RH.　Meanwhile,　the　ratio　of　salts　in　the　CMOF　can　be　adjusted　with　the　proportion　of　dispersants,　the　cyclic　adsorption　test　indicated　that　AlFuNaOH-2　maintained　the　water　adsorption　capacity　of　1.62　g　center　dot　g(-1)　without　deliquesce.　This　work　provides　a　new　strategy　for　synthesizing　CMOFs　with　excellent　water　adsorption　performance,　which　can　potentially　promote　the　application　of　MOF　in　AWH.