我们将与圆锥曲线弦的中点有关的问题,称为圆锥曲线的中点弦问题.圆锥曲线的中点弦问题是高考常见的题型,在选择题、填空题、解答题中都是命题热点.它的一般方法是:联立直线与圆锥曲线的方程,借助一元二次方程的根的判别式、根与系数的关系、中点坐标公式以及参数法求解.这种方法的计算量较大,思维能力要求高.因而在高考复习中成为了高中教师与学生都头疼的问题. We will be with the conical chord midpoint related problems, known as the conic midpoint chord problem. Conic midpoint chord problem is a common college entrance examination questions in the choice of questions, fill in the blank questions, answer questions are propositions Its general method is: the simultaneous straight line and conic curve equation, with the root of the quadratic equation discriminant, the root of the relationship between the coefficient, the coordinates of the mid-point coordinates and the parameter method to solve this method is more computationally Large, high thinking ability.Therefore in the college entrance examination has become a high school teachers and students have a headache problem.