Abstract: The paper puts forward spatial information natural language query interface(SINLQI),which can make a geographical information system easier to use.The authors discuss the establishment of dictionary based E-R semantic,Chinese word segmentation,query grammar rule,application field etc.The authors design a set of common interfaces for dictiorary organizing,word processing,grammar and semantic analysis.Using these interface,The authors implement a SINLQI demo based wireless application protocol(WAP).It establishes a base for applying SINLQI to GIS project.