Objective: To establish a method for rapid determination of forsythin content in semi-finished products of infantile cold granule by near IR spectroscopy.Methods: The semi-product sample of infantile cold granule was scanned by near-IR spectrometer, and its spectrum was preprocessed and band selection was carried out.Combined with partial least squares (PLS), a rapid non-destructive testing method for the content of forsythin was established.Results: The determination coefficient R2 of the established model was 94.73, and RMSEP was 0.00247.The validation set samples were predicted and statistically analyzed.There was no significant difference between the predicted value and the real value (P > 0.05).Conclusion: The established model has high accuracy and is suitable for rapid detection of phillyrin content in semi-finished products of infantile cold granule.