Abstract: A water-soluble fluorescent perylene diimide derivative with four carboxylic groups [N,N′-bi(L-aminosuccinic amine)-perylene-3,4;9,10-tetracarboxylic diimide was synthesized using L-Aspartic acid and 3,4;9,10-perylenetetracarboxy anhydride. Red shift of the spectra was observed and the fluorescence of compound was quenched in the presence of Fe³⁺、Pb²⁺、Al³⁺ and Cu²⁺ metal ions，while the quenching of fluorescence was weak in the presence of Hg²⁺、Zn²⁺、Ni²⁺、Co²⁺、Mn²⁺ and Mg²⁺. There is no other anions to interference the detection．The fluorescence mechanism of PTCDA was discussed and the results showed that this method is worth of application and has a broad prospect.