The effect of antisense RNA for urokinase receptor(uPAR) on inhibition of invasiveness of human lung giant cancer cell lines 95D was observed. 500bp fragment of uPAR cDNA between －46bp～+454bp was amplified, and recombined into plasmid pAdeno-X. The recombinant vector was named pAdeno-X-uPAR(－) and pAdeno-X-uPAR(+) respectively. 7 days after transfecting HEK293 cell with linearized pAdeno-X-uPAR(－) and pAdeno-X-uPAR(+), the recombinant adenovirus can be obtained, which were named Ad-uPAR(－) and Ad-uPAR(+) respectively. The virus titre(pfu/ml) of Ad-uPAR(－) was 1.5×10⁸, and the virus titre of Ad-uPAR(+) was 0.5×10⁸. 95D cells were infected with Ad-uPAR(－) and Ad-uPAR(+) in different multiplicity of infection (MOI). Norther blot analysis could detected the expression of antisense and sense RNA for 500 bp fragment of uPAR gene. With the increase of MOI, Western blot analysis indicated that with AD-uPAR(－) infection the protein level of uPAR of 95D cells decreased, and modified Boyden's Chamber assay suggested that the invasive ability of 95D cells also decreased obviously. In 95D cells infected with Ad-uPAR(+), both the mRNA and protein level of uPAR did not decrease, and cells still had high invasive ability. The results indicated that adenovirus is an efficient vector for transferring antisense RNA for uPAR into cells, and antisense RNA for uPAR could obviously inhibit the invasive ability of 95D human lung cancer cells.