According to Wolf and Richard′s vectorial diffraction integral, a model is established and the focusing spots are analyzed to study the focusing of the azimuthally polarized beams and improve the resolution of laser scanning confocal microscope (LSCM). The azimuthally polarized beams focus into a hollow spot, but it becomes into a solid spot after 0~2 π phase modulation. The full-width at half-maximum (FWHM) of the azimuthally polarized spot after 0~2 π phase modulation is 17.6% smaller than that of the radially polarized spot, and is 11.6% smaller than that of the circular polarized spot. The azimuthally polarized spot after 0~2 π phase modulation which has a smaller focusing spot can improve the resolution for LSCM.