Organochlorine pesticides(OCPs)have received much attention due to their toxicity.Re-liable methods to monitor their residues in the environment are needed.Here,magnetic polyamidoamine dendrimers were prepared by co-precipitation,Michael addition,and ami-dation.The magnetic polyamidoamine dendrimers demonstrated good adsorption ability for OCPs—this feature was utilized to construct a sensitive tool for monitoring OCPs in wa-ter samples.The proposed method provided remarkable linearity from 0.1 to 500 μg/L and satisfactory limits of detection from 0.012 to 0.029 μg/L.The spiked recoveries of the four target analytes were 91.8％-103.5％with relative standard deviations less than 4.5％.The magnetic materials had good reusability.The results indicated that the resulting method was an efficient,easy,rapid,economical,and eco-friendly tool for monitoring OCPs in aque-ous samples.