Aim To investigate the regulatory effects of baicalin on apoptosis induced by virus H1 N1 in hu-man pulmonary carcinoma cell A549 . Methods The chips were used to screen the RNA samples in virus-in-fected A549 cells. Differentially expressed genes were selected in the pathway of apoptosis. The mRNA ex-pressions of caspase-3 and -8 were verified by Real-Time PCR. Results With the DNA microarray, the functions of differentially expressed genes involved in apoptosis biological pathways were analyzed by Kyoto Encyclopedia of Genes and Genomes ( KEGG ) Path-way databases. caspase-3, -7, -8, -10, TRAIL, MYD88 , IL1 A and IL1 B were up-regulated in virus-in-fected group. Oseltamivir could down-regulate gene ex-pressions of caspase-3 ,-4 and-8 . High-dose of baica-lin could down-regulate gene expressions of caspase-3 ,-4,-6 and -8. Except gene expressions of above, low-dose of baicalin could also down-regulate gene expres-sions of IL1RAP and Cn. Real-Time PCR experiments showed that baicalin could significantly decrease mR-NA expression of caspase-3 , -4 , -6 , -8 , IL1 RAP and Cn ( P < 0. 01 ) , compared with the virus-infected group. The results also figured that the interference ef-ficacy of low-dose baicalin was better than that of high-doses. As expected, real-time PCR data were in good agreement with the microarray assay. Conclusions Baicalin can be detected in their suppression effect of caspase-3,-4,-6, and -8 mRNA expression, so it re-sists against the apoptosis to fight against influenza vi-rus in vitro.