Dynamic behavior of magnetic domain structures and relationship between crystal structures and the magnetic domain structures in strongly correlated transition metal oxides were investigated by Lorentz electron microscopy. We found that there are interactions between magnetic domain structures and crystallographic defect structures, such as twin boundaries and antiphase boundaries. We review the characteristic magnetic domain structures in distorted perovskite-type Nd1/2Sr1/2MnO3 and double perovskite Ba2FeMoO6.