农药最高残留限量（MRL）是指在生产或商品贮运过程中，直接或间接使用农药后，在食品和饲料中允许形成农药残留的最大浓度，表示单位为mg/kg。不同国家进口食品时，对农药最高残留限量均有不同的标准，日本是我国大米的主要进口国家。我国加入WTO后，食品安全卫生标准在市场准 Maximum Residue Limits (MRLs) of pesticides refer to the maximum allowable concentration of pesticide residues in foodstuffs and feedstuffs, expressed in mg / kg, after the pesticide is directly or indirectly used during storage or transportation. Different countries import food, the maximum residue limits have different standards for pesticides, Japan is China’s major rice importing countries. After China’s accession to the WTO, food safety standards in the market