With calcium phosphate method, humanhepatoma cell line of Qidong, China wascotransfected by a recombinant plasmid contain-ing full length trimer of HDV cDNA(pSVL D)and a plasmid containing neomycin-resistantgene (pSV-neo). After selection with neomy-cin analogue G418, 2 stable G418 resistant cellclones (QGY-W911 and QGY--W913) were ob-tained. These two cell clones were detectedfor HDV cDNA by Southern blot HDV RNA by