In chemical plating of nickel and chromium on steel, studies on various factors affect-ing the plating operations were carried out. The optimum bath compositions and operat-ing conditions were obtained. The structure and properties of the as deposits or deposits after heat treatment were investigated. (1) The most optimum conditions for the chemical nickel and chromium plating were; 〔Ni2+〕/〔H2PO2-〕; 0.5∼0.8, 〔Cr3+〕/〔H2PO2-〕; 0.6∼0.9 PH;5.0∼5.5, temperature; 90∼95$^{circ}C$ (2) In the case of nickel deposition, the hardness of deposits increased with increasing phosphorous contents. Heat-treating at the temperature range 200$^{circ}C$ to 600$^{circ}C$, the maximum hardness of deposits was obtained at 400$^{circ}C$ and decreased at temperature above 400$^{circ}C$ due to growth of Ni3P. (3) Corrosion resistance of chemical nickel deposits was improved with increasing of p-hosphorous contents and heat treating temperature.