笔者最近对有心圆锥曲线的一些特殊点和线作了些研究 ,得到了一组十分有趣的性质 ,现说明如下 ,供读者参考 .定理 1　设直线l经过双曲线x2a2 -y2b2 =1(a 0 ,b0 )的焦点F ,交双曲线的两条准线于A ,B两点 ,O是双曲线的中心 ,e是离心率 ,l的倾斜角为θ(θ∈ ( 0 ,π) ) ,则OA ⊥ The author recently made some research on some special points and lines of the concentric conic curve, and obtained a very interesting set of properties. The explanation is as follows for the reader’s reference. Theorem 1 Let the linear line go through the hyperbola x2a2 -y2b2 = 1 (a 0 , b0) The focal point F, the two guidelines of the hyperbola are at points A and B, O is the center of the hyperbola, e is the eccentricity, and the tilt angle of l is θ(θ∈ ( 0 ,π) ). OA ⊥