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The orbital period changes of the contact binary AW UMa are investigated, and a secular period decrease of the order of -2.0 x 10 -2 sy-1 was detected. It was found that the wave-like shape of the observed period changes of AW UMa can be fitted either with one sinusoidal periodic term of 29y with amplitude 1.25 x 10-6 d, or they could be the result of multiple periodic terms.