An artificial fish-swarm based coverage-enhancing algorithm(AFCEA) for visible light sensor networks is proposed.In AFCEA,the improved optimization algorithm is used into the solution for coverage-enhancing in directional visible light sensor networks with the rotational direction model.Compared with other classic directional sensor networks coverageenhancing algorithms,AFCEA can achieve a higher directional sensor networks coverage with less iterative computing times. An artificial fish-swarm based coverage-enhancing algorithm (AFCEA) for visible light sensor networks is proposed. In AFCEA, the improved optimization algorithm is used into the solution for coverage-enhancing in directional visible light sensor networks with the rotational direction model. Compared with other classic directional sensor networks coverage- enhancing algorithms, AFCEA can achieve a higher directional sensor networks covering less iterative computing times.