As Pollution sources 13 set of coal boilers in Ningjing were monitored，the results showed that meraury was mainly in gas phase in the coal-firedpower plant flue gas,the emission concentration was 0.16~15.9μg/m3，and was far lower than the standard limit;Curves trend of mercury content in coal andpower plant flue gas were roughly similar,the correlation coefficient is 0.91 ,theecoalfired power plant unit capacity,power load inversely affected the average mercury emission factors;Electrostator,wet desulfurization and purification with selective catalytic reductive reduction process configuration greatly contributed to renoval efficiency of mercury,up to 95.4%.