本文通过合成高密度尖端的Au-Ag合金纳米海胆，实现了对有机磷农药乙基对氧磷和有机氯农药γ-六六六的检测。首先合成Ag纳米颗粒，然后用L-多巴还原Ag纳米颗粒，最终形成高密度尖端Au-Ag合金纳米海胆结构。高密度尖端结构用作SERS基底，通过便携式拉曼光谱仪实现对有机磷农药乙基对氧磷和有机氯农药γ-六六六的检测，结果显示具有较高的灵敏度。该方法简单、方便、灵敏度高，有望实现对农药残留高灵敏的现场检测。

The SERS detection of organophosphorus pesticide ethyl paraoxon and organochlorine pesticides γ-666 were achieved by the high-density Au-Ag alloy nanourchin as SERS substrate.The Ag nanoparticles were synthesized firstly,then L-dopa was used to reduce the Ag nanoparticles,and ultimately the formation of Au-Ag alloy nanourchin structure.Using this high density tipped structure as the SERS substrate to detect the organophosphorus pesticide ethyl paraoxon and organochlorine pesticides γ-666 on the portable Raman spectrometer,and the results showed high sensitivity.Therefore,our platform for the detection of pesticide residues provide a simple,convenient and high sensitivity method.