The purpose of this article is to introduce the CoeZneP film coated on the nanodiamond cores by electroless deposition. The surface morphology, composition and magnetic performance of the coatings are studied with the help of transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), an energy dispersive X-ray detector (EDX) and the vibrating sample magnetometer (VSM). The results showed that the change of film composition and magnetic characteristics were dependant on the content of Cobalt, Zinc and Phosphorus. Evidently the coercive force was affected by the atomic composition of alloy film While the best proportion (the optimal composition mass ratio of Cobalt and Zinc was 1: 4) in alloy film, the alloy film has good electromagnetic properties, even though the Phosphorus wt.% >= 3%. (C) 2010 Elsevier B. V. All rights reserved.