Environmental waste treatment technology is transforming from incineration system to pyrolysis gasification system. And there it is necessary for our country to adapt gasification system urgently to prevent the land pollution and lack of landfill area. The objective of this study was to determine the pesticides residues of derived product of pyrolysis gasification system for recycling of waste plastic by gas chromatograph-mass selective detector and nitrogen phosphorus detector. The residual pesticides were not detected in derived product of waste recyling. But some pesticide was detected on raw level (0.02 ～ 0.05 ppm) in waste plastic sample.