Turbine flowmeter is widely used in process measurement and control instrument. However, turbine flowmeter is susceptible to interference caused by fluid viscosity, and the measurement precision in practical applications cannot be ensured and the turndown ratio is limited. Aiming at the nonlinear characteristic of the turbineshedding sensor, a realtime digital signal processing system was developed based on MSP430, and the system obviously implements the nonlinear correction to vortex senor by storing the datas processed with linear interpolation of the sensor in the Erasable Programmable Read Only Memory. Meanwhile, the flowmeter also has a 4~20mA current output , frequency output and RS485 communication function which make it compatible with industrial instrumentation.