设K=Fq2为含有q2个元素的有限域，q为奇素数的幂，*：a→a*=aq是Fq2的一个二阶自同构．本文用几何方法证明了除K为F32而n=4的情形外，Fq2上的酉群Un（V）可由2个元素生成．

Let K=F_(q~2) be a finite field with q~2 elements where q is a power of odd prime, and *: a->a~*=a~q be an automorphism of order 2 for all a implied by F_(q~2). In this paper, we show by geometric method that the unitary groups U_n(V) over F_(q~2) may be generated by two elements, except that K is F_(3~2) and n=4.