Abstract: In order to locate the magnetic object with a high accuracy for magnetic dipoles, this paper proposes a formula for the space coordinates of the magnetic dipole and the magnetic field gradient based on an equivalent model, and an integrally full gradient tensor magnetic field sensor is designed. Nine magnetic field gradient values and three magnetic fields can be measured at one time. The results of simulation are verified by experiments with good agreement, and the validity of the method is shown when the intensity of the magnetic moment is 2 A·m², the location error is not more than 10% within 0.5 m to 1 m when the radius of the sensor is 0.05 m. The causes of the location error is analyzed, including the distance between two sensors(i.e. the baseline distance) and their radius on the location of the magnetic field gradient.