Antimony doped Cd0.7Ni0.3Se thin films have been synthesized by chemical bath deposition method. The various deposition parameters such as composition of reactive bath, pH of the solution, deposition temperature, deposition time, speed of rotation, etc. have been optimized for obtaining good quality films. X-ray diffraction studies revealed the polycrystalline nature of samples with the solid solution of Cd0.7Ni0.3Se:Sb, having a hexagonal phase structure. Scanning electron micrograph suggested that the films are homogenous, without cracks and well cover the glass substrate. Film composition was determined by atomic absorption spectroscopy. Optical absorption data showed the presence of direct band gap transition. The specific conductance of Cd0.7Ni0.3Se:Sb thin films for all the films was found to be of the order of 10-6 (Ω cm)-1.