Abstract: The Euler inverse method is firstly applied to discriminate me multi-dipoles in a spacecraft by using the magnetic field data and the magnetic gradient tensor data measured around the spacecraft model and to calculate the position and the magnet paraeters of those magnedc components. A grid一type measurement method is developed according to the way the magnetic gmdient tensor data are coUected. Then the multi-point Euler inverse equation is deduced, and a method of detell：nining the best inverse solution is put forward to optimize the process with a genetic algorimm. Computational results show that the best resolution higher than 0.01m can be expected in case that several dipoles are located randomly in a narrow field.