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Based on wavelet analysis, fractal theory and ECT (Electrical Capacitance Tomography) technique, a soft-sensing system of gas-solid fluidized bed is established, which can implement the on-line identification and the monitoring of the flow regime, and also can measure the voidage of the gas-solid fluidized bed. In this system, wavelet analysis and fractal theory are used to analyze and identify the flow regime by processing the signals of pressure fluctuation; a 12-electrode ECT system is used to display the flow state and calculate the voidage of gas-solid fluidized bed by using a novel image reconstruction algorithm. Experimental results show that the soft-sensing system is effective. It can improve the accuracy of identification of flow regime and can measure voidage of gas-solid fluidized bed with an error less than 5%.