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We investigate topological entropy of periodic Coven cellular automatas; that is,the maps FB:{0, 1}Z→{0,1}Z defined byFB（x）i = xi +rΠj=1(xi+j+bj)（mod 2）,where B = b1b2··· br ∈ {0, 1}r（r ≥ 2）, is a periodic word. In particular, we prove that