The product is a fluoroquinolone antibacterials, with broad-spectrum antibacterial effect, especially for aerobic gram-negative bacilli high antibacterial activity, on the following in vitro bacterial with good antibacterial effect:Enterobacteriaceae most bacteria, including citric acid bacterium, Enterobacter cloacae, Enterobacter aerogenes,enterobacter, Escherichia coli rare bacterium, Cray Borrelia bacteria of the genus, proteus, Salmonella, Shigella,yersinia genus Vibrio, etc.. Norfloxacin lactate