Recently,　methanol-to-olefins　(MTO)　technology　has　been　widely　used.　The　development　of　new　adsorbents　to　separate　MTO　products　and　obtain　high-purity　ethylene　(C2H4)　and　propylene　(C3H6)　has　become　an　urgent　task.　Herein,　an　exceptionally　highly　water-stable　metal-organic　framework　(MOF),　[Cu-3(OH)(2)(Me(2)BPZ)(2)](solvent)(x)　(1)　(H(2)Me(2)BPZ　=　3,3　＇-dimethyl-1H,1　＇　H-4,4　＇-bipyrazole)　with　hexagonal　pores,　has　been　elaborately　designed　and　constructed.　After　being　soaked　in　water　for　7　days,　it　still　maintains　its　structure,　and　the　uptake　of　N-2　at　77　K　is　unchanged.　The　adsorption　capacity　of　C3H6　can　reach　138　cm(3)　g(-1),　while　the　uptake　of　C2H4　is　only　52　cm(3)　g(-1)　at　298　K　and　1　bar.　The　dynamic　breakthrough　experiments　show　that　the　mixture　of　C3H6/C2H4　(50/50,　v/v)　can　be　efficiently　separated　in　one　step.　High-purity　C2H4　and　C3H6　can　be　obtained　through　an　adsorption　and　desorption　cycle　and　the　yields　of　C2H4　(purity　＞=　99.95%)　and　C3H6　(purity　＞=　99%)　are　84　and　48　L　kg(-1),　respectively.　Surprisingly,　when　the　flow　rate　is　increased,　the　separation　performance　has　no　obvious　change.　Additionally,　humidity　has　no　effect　on　the　separation　performance.　Finally,　theoretical　simulations　indicate　that　there　are　stronger　interactions　between　the　C3H6　molecule　and　the　framework,　which　are　beneficial　to　capturing　C3H6　over　C2H4.