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In order to search an appro priate pret reatment method to nondest ruct ive measure vitamin C
co ntent of umbilical orange, the ef fect of 11 pretr eatment methods to the model based on PLS has
been compar ed. T he result s show ed that the best ef fect w as wav elet do-noised. It s R w as
0. 957 4, it s R MS ECV w as 3. 90, it s best w av e band w as 7 501. 7~5 449. 8 cm- 1, and it s principal
element w as 8. T he w avelet do-noised was an ef ficient method to nondest ruct ive measure vitamin
C content of umbilical o rang e w ith near-inf rared spect roscopy.