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Objective:To analyze initially the differences of miRNAs expression profiles in human pancreatic cencer cell lines by microarray technique.Methods:A total of 743 probes were designed according to lhe known miRNAs sequences of human,mice,and rats.miRNAs microarray was manufactured and its credibility was verified.Total RNAs were extracted and miRNAs were separated from human pancreatic cancer cell lines(SW1990,Capan-2.BxPC-3,Aspc-1,and Panc 1)and immortal human pancreatic duct epithelial cell line H6C7.They were labeled with T4 RNA ligase.then were hybridized with microarray.Through array scan and analysis,miRNAs expression profiles in pancreatic cancer were obtained.The results were verified by Northern blotting and RT-PCR.Results:A totsl of 63 miRNAs related to pancreatic cancer were found to be differentially expressed in 5 pancreatic cancer cell lines.including 25 down-regulated and 38 up-regulated miRNAs.Expres- sions of mir-21 and let-7 were also confirmed.Conclusion:The results suggested that miRNAs expression profiles could befound in pancreatic cancer cells.