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Sensor networks can be used to sense, collect and process information of monitored objects and transfer the information to users. It has been applied in many domains, such as military, environment observation, calamity forecasting, geo-spatial explore. A sensor Web refers to web accessible sensor networks and archived sensor data that can be discovered and accessed using standard protocols and application program interfaces (APIs). The sensor Web achieves the cooperation, series, harmony and consistency of data acquisition, abstraction and distribution. It is web-centric, open, interoperable, smart, and dynamical and is a new fashion of sensor deployment, data acquisition and information abstraction. In this paper, a framework of spatial sensor Web is designed. This framework includes SOS, SPS and some other services and integrates geographic information systems (GIS) which has the abilities of spatial locating and spatial analysis. The framework follows the sensor Web specifications defined by OGC and can accommodate and receive all kinds of sensor services and data. It enables the interoperability between different sensors, sensor systems and users and "plug-and-play" web-based sensor systems. A prototype of spatial sensor Web has been developed which integrates a sensor network of weather station to sensor web and GIS.