Trichlorfon is widely used in agricultural production. The maximum residue limits and detection technology of trichlorfon are very important for controlling excessive trichlorfon residues and ensuring the safety of agri-products. The paper introduced the current status of the making and revising of the standard for maximum residue limits of trichlorfon in agri-products, gave the overview of the detection methods of organophosphorus pesticide residues trichlorphon, including infrared spectroscopy, molecular imprinting, electrochemical method, chromatography, enzyme reagent kit method and biosensor technology, and then further analyzed the characteristics of each method and its developing trends. ［Chinese Fishery Quality and Standards, 2014, 4(5):49-54］