While the seasonal influenza viruses spreading around the world cause the annual epidemics, the recent outbreaks of influenza A virus subtype H5N1 and pandemic H1N1 have raised global human health concerns. In this review, the applicabilities of computational techniques focused on three important targets in the viral life cycle: hemagglutinin, neuraminidase and M2 proton channel are summarized. Protein mechanism of action, substrate binding specificity and drug resistance, ligand-target interactions of substrate/inhibitor binding to these three proteins either wild-type or mutant strains are discussed and compared. Advances on the novel antiinfluenza agents designed specifically to combat the avian H5N1 and pandemic H1N1 viruses are introduced. A better understanding of molecular inhibition and source of drug resistance as well as a set of newly designed compounds is greatly useful as a rotational guide for synthetic and medicinal chemists to develop a new generation of anti-influenza drugs.