A HPLC method for the assay of Escitalopram Oxalate Tablets was established.The HPLC method was used with C18 column (250 mm×4.6 mm, 5 μm).The mobile phase was phosphoric acid buffer solution-methanol (51: 49), with the detection wavelength at 238 nm.The linear range of escitalopram was 25-150 μg/mL (r=0.9999).The average recovery rate was 99.60%, RSD=0.44%.This method is convenient with good specificity and good reproducibility for the assay of Escitalopram Oxalate Tablets.