Abstract: The data of the vector magnetic field and the magnetic full tensor are the foundation of the multi-magnetic source inversion. For the measurement of the vector magnetic field and the magnetic full tensor, a sequential scan method in the matrix mode is proposed. Two data structures, the crisscross structure and the hexahedron structure, for the computation of the magnetic full tensor through the magnetic field are used in the MATLAB simulations. It is shown that the results obtained by using the two data structures are very close with differences less than 10%. The influence of the baseline length on the results of the magnetic full tensor is analyzed, and the influence is shown to be great and it increases with the increase of the dateline length.