With the development of the simulation technology of the magnetic field

there are several kinds of magnetic sources that can simulate the target magnetic field with a high degree of accuracy

but it's difficult to measure its similarity in traditional ways. To solve this problem

a new similarity measurement eigenvalue of magnetic field based on discrete Fréchet distance is proposed in this paper. To get the eigenvalue

the evaluation index of the distance between discrete points in Fréchet method has improved according to the characteristic of magnetic field curve

after that

a parameter which can measure the degree of similarity of the horizontal coordinate and eliminate the different speed of the target is proposed

then the similarity measurement eigenvalue is obtained

at last

its feasibility is verified by examples. Compared with the traditional methods

this eigenvalue can be used to evaluate the similarity of the closer magnetic field curves.