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A great number of sensor technologies are applied in the Intet of Things (IoT) currently and more are emerging,which makes the IoT a heterogeneous network.This paper discusses the convergence and integration problem in IoT.A Service-Oriented Middleware for Heterogeneous Environment (SOMHE) in IoT is proposed.The purpose of the middleware is to shield the difference between protocols in the sensor layers such as Radio Frequency Identification (RFID) and ZigBee by defining the data conversion and mapping model.A Web service interface is supplied by this middleware,thus the complexity of high level application development can be reduced greatly.The feasibility and reliability of this middleware is verified by a demonstration system.