According to the idea of "combining the inorganic distorted polyhedron with asymmetric conjugate organic molecules", preliminary exploratory results of nonlinear optical material of organometallic complex are reported for the first time. Comprehensive study was carried out on the growth and the linear and nonlinear optical properties of the typical material--bis-thiourea cadmium chloride (BTCC). The results show that the organometallic complex is a category of promising nonlinear optical material.