Abstract: Using a thermal balance and 200 kg pilot coke-oven, the thermal weight loss behavior and characteristics of the cokes produced from co-coking of waste plastics (WP), organic additive (OA) and the coking coal supplied by SHOUSTEEL in Beijing were studied. The results showed that the synergetic effect arising from the pyrolysis of WP, OA and the coal in their common temperature range of weight loss will affect the quality of coke. Moreover, during co-coking the mixture of 1% WP, 2% OA and 97% coking, the addition of 2% OA can eliminate the negative influence of the 1% WP on the quality of coke produced from co-coking, thus resulting in the increase of M40 and CSR and decrease of M10 and CRI obviously. Therefore, the technology proposed will have bright outlook in industrial applications.