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Let Un be the unit polydisc of Cn and φ= (φ1,...,φn) a holomorphic self-map of Un. Let0 ≤α< 1. This paper shows that the composition operator Cφ is bounded on the Lipschitz space Lipα(Un)if and only if there exists M > 0 such that∑nk,l=1|φl/zk(z)|( 1-|zk|