Objective Through the 6^th Chinese Total Diet Study （TDS）， the contents of marker polychlorinated biphenyls （mPCBs） in representative Chinese dietary samples were obtained， and the dietary exposure assessment and temporal trend analysis of mPCBs were carried out.Methods Istope dilution dilution-high resolution gas chromatography-high resolution mass spectrometry （HRGC-HRMS） was used to determine mPCBs in food composite samples， and the intakes of mPCBs of Chinese residents represented by the standard man were evaluated by deterministic approach.Results The mPCBs were detected in all composite samples. The contents of mPCBs in varied dietary samples were different， and the animal diet were significantly higher than that of plant diet with the lowest in cereals and the highest in aquatic foods. The dietary intake of mPCBs of Chinese residents was 0.25［0.11， 0.62］ ng/kg?BW?d （geometric mean ± geometric mean standard deviation）. Compared with the results of the 4^th TDS and 5^th TDS， the dietary exposure level of Chinese residents decreased significantly （P<0.05）.Conclusion Although mPCBs were detected in all composite samples from 6^th TDS， the dietary exposure level of Chinese residents continued to decline compared with 4^th and 5^th TDS. Compared with the relevant research results from European and American countries， the dietary exposure level of Chinese residents is relatively low.