The ferroelectric ceramics samples of SrBi4-x/3Ti4-xMoxO15(x=0.00, 0.003, 0.012, 0.03, 0.06, 0.09) have been prepared by the conventional solid-state reaction method. X-ray diffraction analysis shows that the crystal structure of SrBi4Ti4O15 (SBTi) is not affected by Mo-doping. The scanning electronics microscope (SEM) images indicate that all the samples consist of sheet grains and the grain size is reduced by Mo-doping while the ferroelectric properties are improved significantly. The remanent polarization (2Pr) increases at first，then decreases with the increasing Mo content. At x=0.06, the 2Pr maximizes at a value of 26.5 μC/cm2, which about 117% higher in comparison with that of SBTi. And the coercive field of SBTi is increased only about 20%. The Curie temperature of the samples varied slightly after doping, which implies that the good thermal stability of SBTi is not sacrificed.