Diamond-like carbon (DLC) and carbon nitride (CNx) films were deposit ed successfully by the electrochemical method.The conditions of deposition were discussed also.Scanning electron microscope and Fourier transform infrared technigue were used to investigate the surface morphology and the bonding structure.The results of the field emission show that the turn-on fields of DLC films and CNx films are 88 and 10V/μm respectively.Under the field of 23V/μm,their current densities are as high as 10 and 037 mA/cm2, respectively .