本文对河北中考中出现的由“形动”而引发的动态几何问题略作分析.举例如下:1.直线的平移运动问题例1(2000年)在如图1所示的直角坐标系中,点C在y轴的正半轴上,四边形OABC为平行四边形,OA=2,∠AOC=60°,以OA为直径的⊙P经过点C,点D在y轴上,DM为始终与y轴垂直且与AB边相交的动直线.设DM与AB边的交点为M(点M在线段AB上, In this paper, Hebei senior high school entrance examination appeared by the “dynamic” caused by a brief analysis of the dynamic geometry, for example as follows: 1. Linear translation problems Example 1 (2000) in the rectangular coordinate system shown in Figure 1 , The point C is on the positive semi-axis of the y-axis, the quadrilateral OABC is a parallelogram, OA = 2, ∠AOC = 60 °, ⊙P with OA as the diameter passes through point C, D is on the y-axis, DM is always Perpendicular to the y-axis and the intersection of AB and the intersection of the straight line set DM and AB edge of the intersection of M (M point AB in the segment,