确定磁性体在剖面上的有效磁化强度矢量I_s（模量I_s，磁化倾角i_l），是磁测计算中首先遇到的问题。对于均匀磁化情况，求出剖面上的磁场分量后，利用公式I=kT即可得到I_s。但是，在磁各向异性条件下，磁性体各处的I_s都不同，尤其在沉积变质铁矿区，不仅磁各向异性，而且还有退磁作用， Determining the effective magnetization vector I_s (modulus I_s, magnetization inclination i_l) of the magnetic body in the cross section is the first problem encountered in the magnetic measurement. For the uniform magnetization, find the magnetic field component of the cross section, using the formula I = kT I_s can be obtained. However, under the condition of magnetic anisotropy, I_s of magnetic body is different everywhere, especially in the area of ​​degenerated iron deposit, not only magnetic anisotropy, but also demagnetization,