The light propagation manipulated by surface plasmon polaritons is applied widely in micro-nano integrated optics and optical communication. The model of metal slit array structure with liquid crystal filled in the slits is proposed. Using surface plasmon′ s transmission effect, several novel metallic micro-nano optical lens are designed by setting the slit width and director angle of liquid crystal. The finite-difference time-domain (FDTD) method is adopted for numerical simulations of three slits, six slits and five slits array structure. The results show that three functions of the light deflecting, light splitting and light focusing are achieved. The deflecting angle, splitting angle and focus length can be manipulated, and the light propagation controlling can be reached by changing the slit width and director angle of liquid crystal. This design has a good application prospect for its simple structure and easy frabrication by experimental equipment like electron beam lithography system.