Abstract: Research and exploration of performance evaluation at specific levels, departments and projects in all round way is a strategic focus for deepening the performance evaluation of public sectors in China, which is also the necessary and crucial stage for establishing the performance evaluation system based on China’s current national conditions. With the methods of balance score card, 360－degree feedback assessment, key performance indicators and others, the index system for public sectors performance evaluation is built. And by taking Liaoning provincial department as an example, the only output multi-objective analysis of DEA model is used to empirically prove that the system is suitable for China’s public sectors performance assessment. At the same time, quantitative methods are employed to discuss many problems, which exist regularly in current public sectors performance evaluation, such as the index system settings, the role of evaluation main body, and the factors affecting the results. In conclusions and recommendations, three points are emphasized, that is, setting scientific standards for assessment, playing the role of external evaluation, and enhancing the objectivity of the assessment results.