The synthesis and functional study of one-dimensional free radical-metal chain compound has been a hotspot task in molecule material, especially in composing high Tc molecule ferromagnet. A new compound [BrBzPy] [Ni(dmit)2] has been prepared and characterized. The crystal structure at room temperature was determined. The crystal is triclinic with space group P21/c, a = 0.627 5(1) nm, b = 1.743 8(3) nm, c = 2.283 9(3) nm, alpha = 90 degrees, beta = 91.87(1) degrees, gamma = 90 degrees, V = 2.497(7) nm3, Z = 4, Mr = 700. 57, and Dc = 1.863 g x cm(-3). The planar [Ni(dmit)2]- is nearly perfect, which shows that it has good conjugate characteristic and is a 1-D magnetic chain compound.