Environmental waste tretment technology is transforming from incineration system to pyrolysis gasification system And there it is necessary for our country to adapt gasificatlion 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 chromstograph-mass selective detector and nitrogen phosphorus detector The residual pesticides were not detected in derived product of waste recycling But some pesticide was detected on raw level (0 02 - 0 05 ppm) in waste plastic sample