The disclosed array of monochromatic source includes substrate, photon crystal micro cavity and waveguiding structure combined on substrate firmly. Photon crystal micro cavity and waveguiding structure is composed of a series of periodic arranged cylindrical air columns, which are formed on background dielectric material through etching method, containing specific defects. The background dielectric material is composed of developed arranged following parts in sequence: n-GaN low electrode layer, structure of InGaN/GaN quanta trap, or luminous layer in AlGaN/InGaN heterojunction structure, and p-GaN up electrode layer. Gallium nitride as light source emits light with width in scores of Nano. Photon crystal waveguide containing different line defects couples the monochromatic light in the width to around of disc without loss nearly. The disclosed structure can obtain good monochromatic light coupled from micro cavity to form an array of monochromatic source even with right-angled turn.