In this paper,the author studied the Hayman direction of meromorphic function.By using the theory of covering surface of Ahlfors,the author proved the theorem the existence of the largest type Hayman direction of meromorphic function of finite and positive order.%用Ahlfors覆盖曲面的方法研究了有限正级亚纯函数的关于型函数的Hayman方向,得到了该类奇异方向的存在性定理,所得结果推广了现有的一些相关结果.
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