摘要: The Beurling-Ahlfors' extension is studied under relatively general conditions and its dilatation fonction is estimated. Particularly, the classic Deurling -Ahlfors' theorem can be obtained under the M-condition. 
                                                        
                              
                             
                            
                            																								
								
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                                        															 姜天权, 郑学良 . 广义Beurling-Ahlfors'扩张的伸张函数的估计[J]. 数学季刊, 1997, 12(2): 75-78.	
																																									     												                                                                                                        	                                                                                                                      Jiang Tianquan, Zheng Xueliang. Estimation for the Dilatation of the Generalized Beurling-Ahlfors' Extension[J]. Chinese Quarterly Journal of Mathematics, 1997, 12(2): 75-78.