A new Schiff base compound P was synthesized and characterized as an Al3+-selective fluorescent probe. Study indicated that this proposed probe P has good selectivity and sensitivity to Al3+ compared to other tested metal ions in ethanol. A linear relationship was found between the fluorescence intensity at 445 nm from 3.0×10-6 to 7.0×10-6 M of Al3+ concentration with a detection limit of 1.0×10-6 M of Al3+. The possible binding mode of P with Al3+ was also suggested.