A novel method of opening-hole virtual repairing in point cloud is proposed based on modified curve contraction flow, which aims to improve the effect of existing means. Firstly, on the basis of calculating the surface normal vector and tangent vector of the hole boundary point, the whole boundary is formed according to the feature line. Secondly, the cross-point of each boundary point is obtained by the intersection of the vertical plane of the tangent vector and the boundary, and a cross-vector is formed with the corresponding boundary point. The growth direction of the boundary point is calculated by using the weighted sum of the inward vector and the cross-vector, and the growth step is determined according to the density of the original point cloud so as to be repaired. Finally, the Laplace smoothing algorithm is utilized to smooth and uniform mesh for obtaining final repairing result. The experimental results show that the similarity of Gaussian curvature distribution of our approach improves by 26.8%, compared with the base surface mesh addition method,wave front method and geometric feature repaired method.