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A multi data fusion intelligent detection instrument based on RTAI is designed and implemented. For the nonlinear problem of output of sensor, we develop a data reconstruction method, using least square fitting and radial basis function error interpolation fusion reconstruction , in the condition of increasing the limited computing quantity, the data accuracy of the sensor is improved; This paper uses ARM11 as the main processor to build the management subsystem, and uses DSP(TMS320F28335) as the coprocessor to build the data acquisition and processing subsystem of μC/OS-II operating system being auxiliary nuclear, then the paper implements the construction of the double kernel embedded operating system ,conducts the gas detection, speed detection, temperature detection, flow testing, the roadway section perimeter and area measurement; We design the state analysis function, analyzing the detected data comprehensively, relying on the library of the evaluation experience to make decision . Field test shows that, the detection with high intelligence, strong data processing ability and other characteristics.