Abstarct: A simple and sensitive flow injection-flam atomic absorption spectrometric(FI-FAAS) procedure was developed for the on-line preconcentration and determinatiom of trace leveles of cadmium(II). A mini-column packed whit a chloromethylated polystyrene functionalized whit N,N-bis(naphthylideneimino)diethylenetriamine (PS-NAPdein) was used for the on-line ennichment of cadminum(II) from samples at pH=7.0. The cadmium was eluted from the mini-colmn using of 1.0M nitric acid. chemical and flow injection variables were optimized for the quantitative preconcentrationand determination of cadmium(II). Under the optiomum conditions, calibration gragh was linear over the optimum concentration rang of 1.00-30.0 mg/L for the preconcentration volume of 10.0 ml sample sulution.The detection limit (DL) value for the preconcen tration of 10.0 ml of sample solution were 0.25 mg/L . An enrichment factor of 50-fold for a sample volume of 10.0 ml was obtained.The relative standard deviation for 7 replicate determination of cadmium (II) at the 2.00, 5.00, 10.0 and 20.0 mg/L level were 5.0%, 4.0%, 3.0% and 2.0%, respectirely. The effect of the presence of various species commonly associated whit real samples was also investigated.The accuraey of the proposed method was demonstrated by analyzing different water samples.