Acetylene is a very important chemical feedstock for modern industry.Many widely used polymer products such as polyurethane and polyester plastics are synthesized from acetylene.1 However,the safe storage and transportation of acetylene still remain challenging because of its explosiveness when compressed under pressures over 2 atm at room temperature.2-5 Here we present a porous metal-organic framework([Cu4(tddb)·(H2O)4]n·(solvent)x,abbreviated as FJI-H8),with both suitable pore space and rich open metal sites,for efficient storage of acetylene under ambient conditions.