A　novel　Cu(I)　complex　[Cu4I4L2]　[L=2-methylpyridyl　pyrimidyl　sulfide]　has　been　synthesized　through　solution　diffusion　method　and　characterized　by　single　crystal　X-ray　diffraction　and　IR　spectrum.　The　title　complex　crystallizes　in　monoclinic　crystal　system　with　P21/n　space　group　with　a=1.004　70(5)　nm,　b=0.893　04(4)　nm,　c=1.815　98(8)　nm,　β=99.847(10)°,　V=1.605　36(13)　nm3,　Z=2,　and　Mr=1　196.40.　The　tetra-nuclear　structure　is　composed　of　the　molecule　[Cu4I4L2]　and　its　three-dimensional　nets　are　constructed　ultimately　by　supra-molecule　weak　interactions　including　hydrogen　bond,　S⋯S　and　π-π　interaction.