The purpose is to identify the differences between goat and cow's milks and their production area by nonlinear electrochemical fingerprint( NEF) technique. NEFs of goat milk and cow milk from different places were determined. The goat and cow's milks were identified by visual features of the fingerprint,and their origins were identified by system similarity patterns. The results showed that,both of the fingerprints of goat and cow's milks were very reproducible. Both kinds were identified accurately by the visual features of their fingerprints,and the origins were determined by system similarity patterns. The similarities of the fingerprints in the same place were 99. 06% ~ 99. 86%,those of different places were 90. 42% ~ 98. 86%; the similarities between goat and cow's milks were 76. 25% ~ 82. 43%; the accuracies to identify the origins was ≥91. 9%,and their average accuracy was 94. 3%; the accuracy of identify the types was ≥94. 6%,and their average was 98. 5%. The conclusion is the goat's milk, cow's milk and their origins can be identified accurately by NEF technique. The method provides a new way of for identifying the authenticity and origin of dairy products.