The growth ,yield and chlorophyll content of spring maize in seasonal arid region with different seeding time treatments were studied. The results showed that maturation period of spring maize was deferred when seeding time was delayed,and yield was reduced for encountering seasonal drought ; seeding time was beneficial to spring maize harvest and avoiding seasonal drought in autumn under appropriate planting technologies such as selecting early maturing variety, early sowing and strengthening the training of management. The appropriate seeding time of spring maize was fi-om the middle ten day...