A quantum cloning machine for general pure states of in an n dimensional quantum system is proposed and discussed. First,a necessary and sufficient condition for a pure state to be cloned accurately is given. Second,the three entanglement indexes D(1)dx ,D(2)dx,D(3)dx of the output state and the index of cloning quality Da of the input state are introduced, the inequality relations between them are established. Finally,some inequality relations on the indices D(1)dx ,D(2)dx,D(3) are proved.%讨论了n维量子系统中纯态的一种量子克隆机.建立了量子克隆机可精确克隆量子态的充要条件.提出了3个纠缠指数D(1)abc,D(2)abc,D(3)abc与克隆质量指数Da,并给出了它们之间的不等式关系.最后,证明了纠缠指数D(1)abc,D(2)abc,D(3)abc之间的不等式关系.
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