文[1]对三角形三种重心的几何性质做了初步研究，本文再研究四边形三种重心的几何性质．所得结果，对简化四边形重心坐标的计算和研究四边形的其他问题，有一定的意义．设四边形ABCD，四边中点分别为E、M、F、N，顶点重心为G0，边界重心为G’、，面积重心为G，△BCD、△CDA、△D The paper [1] makes a preliminary study of the geometrical properties of three kinds of triangle center of gravity. In this paper, the geometric properties of three kinds of center of gravity of quadrilateral are studied. The results obtained have certain significance for the calculation of simplified quadrilateral barycentric coordinates and the study of quadrilateral other problems. Set quadrilateral ABCD, the four midpoints are E, M, F, N, the center of gravity of the vertex is G0, the center of gravity of the boundary is G’, the center of gravity of the area is G, △BCD, △CDA, △D