Abstract: Micro-amount cerium oxide was transferred into the electrode coating of low alloy steel in the experiment, and the formula of mechanical property quantitative relationship between cerium oxide and deposited metal was obtained by calculating and curve fitting in MATLAB function.The results show that the tensile strength error decreases from 44 MPa calculated with empirical formula to 1 MPa with the quantitative formula, and the lower yield strength error from 100 MPa to 2 MPa.The rare-earth quantity can be converted to carbon equivalent and introduced into the quantitative formula as a parameter, which makes the test times and the cost of electrode design reduce.