Magnetic field imaging using polarized pulsed neutrons is one of the most attractive applications of the energy-resolved neutron imaging technique. As the interaction between magnetic fields and a neutron spin depends on the neutron wavelength, analysis of the wavelength dependent polarization makes it possible to quantify the both magnetic field strength and direction. Hence, the combination of Time-of-flight method of pulsed neutron beam and three-dimensional polarization analysis is very suitable to the neutron magnetic field imaging technique. In this paper, we will explain about the resent results on magnetic steel sample and on spatial magnetic field from the electromagnet performed at BL10 of MLF in J-PARC.