Cluster algebra of finite type

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It is proved in the paper that a cluster algebra is of finite type if its Cartan counter part of the principal part of its seeds is a Cartan matrix of finite type. If the initial quiver of a cluster algebra is a Dynkin quiver, is it a cluster algebra of finite type? Thank you very much.

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Yes.

For skew-symmetric cluster algebras, the matrix of a seed can be represented either by a skew-symmetric matrix or by a quiver. The vertices of the quiver correspond to columns (or rows) of the matrix, and the number of arrows from $i$ to $j$ in the quiver is the $(i,j)$-th entry of the matrix, provided it is positive. With this correspondence, saying that "Cartan counter part of the principal part of its seeds is a Cartan matrix of finite type" is exactly the same as saying that the quiver "is a Dynkin quiver". According to the paper you linked to, one of the seeds satisfies this condition if and only if the cluster algebra is of finite type.