In order to reduce or eliminate multipath interference and multiple access interfe rence (MAI) of the approximately-synchronized code-division multiple-access(AS-CDMA) system, and satisfy the needs of increasing user capacities of the system,constructions of zero-correlation zone complementary sequence sets are proposed. Zero-correlation zone complementary sequence sets have larger size compared with conventional ones and can support more users in communication systems. Based on perfect sequences and row-orthogonal matrices, two zero-correlation zone complementary sequence sets are nstructed with large cardinality. The first one is an optimal zero-correlation zone complementary sequence sets and constructed by using the properties of perfect sequences and row-orthogonal matrices. The second one is an almost optimal zero-correlation zone complementary sequence sets and constructed by using the same method.