Dane particles were purified from human plasma and the DNA containing the single strand region was filled-in by endogenous DNA polymerase. Recombinant plasmid pHBV-315 was constructed by inserting the total HBV DNA into pBR322 DNA. Restriction enzyme map and nucleotide sequence of pHBV-315 suggested that the HBsAg subtype of the cloned HBV DNA is adr and how HBsAg gene is arranged in pHBV-315. pHBV-15 was constructed to direct the expression of HBsAg gene. When LMTK-cells and E.coli were transformed by pHBV-15, HBsAg was produced in LMTK-cells but not in E.coli.