Objective: The different parts of Salvia miltiorrhiza Bge f. alba was analysed by IR spectroscopy. Method: Multi-steps infrared macro-fingerprint methed(infrared spectroscopy

secondary derivative spectroscopy and two dimensional correlation infrared spectroscopy) was used to analyse the powder

ethanol-soluble and water-soluble extracts of the root

stem

leaf

flower of S. miltiorrhiza. Result: In effective component characteristics absorption area (1 800-1 200 cm-1 band) the peak intensity of the leaf was higher than root

stem and flower. In the one-dimensional spectra

except flower

the ethanol soluble extract of root

stem and leaf all appeared the adjacent quinone C=O characteristic peak absorption 1 692 cm-1 or 1 670 cm-1. In water-soluble extract

the skeleton vibration peak 1 610 cm-1 of aromatic compounds (like salvianolic acids B) in leaf and flower was more obvious than root and stem. In the secondary derivative spectra

ethanol-soluble extract and water-soluble extracts all appeared the characteristic peak of standard substance

which confirm the conclusions of one-dimensional spectrograms. In the two-dimensional correlation spectra

the automatic peak position and intensity of different parts of S. miltiorrhiza were different. Conclusion: The kinds and content of chemical composition of different part of S. miltiorrhiza were different

and the stem

the leaf and the flower were resources to be further exploited.