The esterase isozyme zymograms of 47 isolates of Beauveria bassianafrom different hosts and from various parts of China and other 12 countriesof North America and Europe were analysed by using thin layer-IEF electro-phosis. The result shows 3 main enzymatic profiles which can be identifiedaccording to the zymograms and their differences of isoelectric points (PI)and scanning distance (Y). There is a pH value suitable for each isolate,which may be helpful not only to improve the activity of esterase, but als...