The maximum target coverage with the minimum number of directional sensor nodes, known as maximum coverage with minimum sensors(MCMS) problem, is an important problem in directional sensor networks. In order to ensure the network coverage and event reporting, the target coverage algorithm(TCCA) based on clustering is proposed. By self-organizing clustering and sensing sector assignments in each cluster, the TCCA algorithm can solve this problem and enhance the network lifetime in an energy-efficient way. Comparing to the existing algorithms, the simulation results show the effectiveness of TCCA.