A new method of automatic region registration method based on spatially assistant planes is introduced in this paper.The method integrates both algorithm features of the global-region registration method’s high precision and the local-region registration method’s low complexity.Spatially assistant features with the same angle and resolution are calculated from

and the gray similarity is defined by normalized cross-correlation coefficient.By introducing the spatially assistant planes

spatially assistant features and gray similarity are combined together to register images.Two groups of images SPOT and ASTER

ASAR and ASTER

were tested.A mosaic was formed from the reference and re-sampled sensed images.In the mosaic

lineal features are well-aligned

which effectively proves that the automatic registration has a high accuracy.