Objective:To obtain DNA of human Helicobacter pylori heat shock protein A

and construct a recombinant vector containing gene encoding HspA for nucleotide sequence analysis.Methods:The target gene was amplified from Hp chromosome by PCR

and then digested by restricted endonuclease enzyme of kpn I

BamH I simultanously

and inserted into the prokaryotic expression vector pET32a(+) digested by corresponding restricted endonuclease enzyme. The recombinant vector was selected and transformed for nucleotide sequence analysis.Results:Enzyme digestion analysis and sequencing showed that the target gene had been inserted into recombinant vector

but as compared with gene reported by GenBank. 1.4 % of the gene mutation and 1.6% of amino acid residues change in Hp happened respectively. The DNA sequence analysis showed the sequence of HspA DNA was almost the same as that published by GenBank.Conclusion:The gene coding for Hp HspA is cloned successfully.The results obtained lay the foundation for research on development of Hp protein vaccine and a quickly diagnostic kit applying to detection of Hp infection.