The research aims to develop WebGIS system and to apply on mobile device for land use (LU) maps as well as land use planning (LUP) maps in Gia Rai district, Bac Lieu province to support spatial data sharing on the internet environment. WebGIS was created base on HTML, CSS and JavaScript programming languages. In addition, an application (App.) on smarphone was applied using App Studio on ArcGIS software to be provided by ESRI. Spatial and attribute databases of land use and land use planning are stored on ArcGIS Online. The results were completed not only revision of maps and land parcels information but also land use planning maps in each commune in Gia Rai district, Bac Lieu province. Moreover, the web page were developed to provide spatial and attributes information of land use and land use planning which are interactive functions including displaying, searching by parcel numbers or by attributes, measurement, map printing, etc. can be accessed on the website of the Land Registration Office in Gia Rai district and on smartphone.