A novel coordination polymer [Cd(2,2′-dipha)(H2O)(phen)]·3H2O was prepared by hydrothermal synthesis and characterized by single-crystal X-ray diffraction.X-ray diffraction indicates that this compound is of triclinic system,space group P-1 with parameters a=0.968 0(5) nm,b=1.193 1(6) nm,c=1.215 6(6)nm,α=71.697(5)°,β=71.741(5)°,γ=74.355(6)°,V=1.242 7(10) nm3,Z=2,T=293(2) k,R1=0.038 0,wR2=0.075 5.