本文说用数值计算法求阳极保护金属的腐蚀电流密度。在该法中建立了三个独立的关系，并用取自很接近保护电位的电化学数据计算了未知数值。用假设数据求出的结果与MF法做了比较。因此，该法的有利条件在于不要求先知未加保护金属蚀电流密度Ic.由于这个限定，表明MF法易受所用的Ic值的微小误差影响，该法却毫不怀疑地计算Ic值。 In this paper, we use numerical method to find the corrosion current density of the anode protection metal. Three independent relationships were established in the law and unknown values ​​were calculated using electrochemical data taken close to the protective potential. The results obtained from the hypothetical data are compared with the MF method. Therefore, it is advantageous that this method does not require the prophet not to protect the metal etch current density Ic. Due to this limitation, the MF method is susceptible to small errors in the Ic value used, and the law is without any doubt calculating the Ic value.