In this paper the conversion efficiency of second-harmonic generation (SHG)in the organic annular fiber is analysed based on classical electromagnetic theory. The phase matching, which can be got by the dispersion of guided modes in the annular fibers, is described in some detail. The hemicyanine annular fiber is fabricated by using LB film technique. SHG is measured by the photodetecting instrument with high sensitivity when intense 1. 06 pm pump pulses from a Q-switched YAG laser propagates through the fiber.