To solve the geospatial information management, sharing and valid use of massive information for Digital Earth, a geospatial information layer sharing model and the solutions of each layer for Digital Earth are advanced in the paper, and the main discussion focuses on data set layer and data item layer. Firstly, combined with the frontier of international geospatial metadata, the Chinese geospatial metadata content standard draft is brought forward for sharing the historical and existing geospatial data on dataset layer.Integrated with WebGIS and based on Z39.50 protocol,geospatial metadata management system for DE construction is designed and achieved. Secondly,taken OpenGIS standard and XML technology into account,geospatial information markup language (GeoML) is put forward to share future geospatial information on data item layer.GeoML standard draft is designed and GeoML prototype based on Web is implemented.The results have greatly promoted the research of the Key Science-Technology Project of the ‘National Ninth Five-Year-Plan'of China