The kit uses a double-antigen sandwich enzyme-linked immunosorbent assay (ELISA) to analyze the existence or not of Human F-H7N7-HA in samples. Add sample to wells pre-coated with one Human Influenza A Virus Subtype H7N7, Hemagglutinin antigen, at same time add HRP-conjugated Human Influenza A Virus Subtype H7N7, Hemagglutinin antigen to bind the analyte, followed by incubation and washing procedures to remove unbound substance. Finally, HRP substrates are added, incubated for detection, and a b