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The lithium battery state of charge (SOC) accurate estimation is an important technology of electric vehicle energy management. In order to improve the accuracy of estimating SOC lithium battery,unscentedSKalmanSfilter (UKF) is used to SOC estimation. And this method can also reduce the extended Kalman filter (EKF) to bring a simple linearization error.When make a battery testing system hardware platform, TMS320F28335 type digital signal processor (DSP) is treat as the main control chip (MCU) . It can realize UKF algorithm and the detection of temperature, voltage, current, and the design of the battery test related experiments. The experimental results show that UKF can real-time estimate lithium battery SOC,and the estimation error is less than 4%, which is higher than the traditional extended Kalman filter (EKF) .