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If the period of an -sequence is with relative prime to , then the vector , a period of the -sequence, can be decomposed in a special way into two subsequences of lengths and . The properties and structures of the -sequence and its subsequences are studied under such decomposition. The following applications are direct consequences. The correlation technique for the detection of - sequences can be improved. The weight distributions of a class of cyclic codes can be easily obtained. A scheme for improving the feedback communication is developed. And a method for designing cyclic codes with desirable weights is suggested.