Structural bioinformatics tools and databases have been developed and applied to study diversified biological problems.Molecular modeling tools were developed to generate 3D structure from sequences of novel genes.It allows us pursue structure based drug design.Applications were made to drug design for SARS, H5N1 and HIV.A octapeptide AVLQSGFR designed by us was synthesized and its antiviral potential against SARS coronavirus (B J-01) was assessed, which demonstrates that AVLQSGFR is the most active in inhibiting replication of the SARS coronavirus compared with other compounds reported so far(EC50 is 2.7× 10-2mg/L, and its selectivity index is more than 3704), while no detectable toxicity on Vero cells under the condition of experimental concentration is observed .