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In the power applications of high temperature superconductor(HTS), it is necessary to stack several HTS tapes together to achieve high current carrying capacity. However, the current would not be well distributed in the multi-tape composites due to the existence of electrical and magnetic interaction inside it. As a result, the AC losses in the composites would be then increased. In order to investigate the detail, the AC losses of multi-tape composites are experimentally studied in this presentation. The average transport AC losses are measured under self and different background AC fields. The results show that the average losses are increased with the external magnetic field and the number of the stacked tapes, and there exists an upper limit of the number of the stacked tapes due to the magnetic coupling effect among the tapes. [ABSTRACT FROM AUTHOR]