Based on CCD images, interference imaging spectral data and DEM data of China’s lunar exploration project (Chang’e-I) and related processed and analytic results, an integrated study of regional geology of Sinus Iridum and Mare Imbrium was conducted, and a series of relevant researches and analyses were carried out. The geological map of the Sinus Iridum Quadrangle (LQ-4) at a scale of 1∶2.5M was preliminarily compiled with the ArcGIS system, and the spatial database of the map was established. Related technical specification, procedure and method for lunar geological mapping have been worked out, so as to lay a foundation for the forthcoming geological mapping of the global moon in China by using the data of Chang’e-II and also for regional geological comprehensive study and geological mapping of other celestial bodies in the future.