文[1]介绍了三角形的垂心的如下性质:定理1三角形的垂心关于三边的对称点在这个三角形的外接圆上.本文以此为基础,提出如下性质:定理2三角形的垂心关于各边中点的对称点在三角形的外接圆上,且以这三个对称点为顶点的三角形与原三角形关于圆心中心对称.用符号语言表达即为: In [1], the following properties of the centripetal triangle are introduced: Theorem 1 The centripetal symmetry of a triangle is on the circumscribed circle of this triangle. Based on this, we propose the following properties: Theorem 2 The centroid of a triangle The symmetry point of the middle point is on the circumcircle of the triangle, and the triangle with the three symmetrical points as the vertex is symmetrical with the original triangle about the center of the circle center.