Combination of Acetyl Salicylic Acid is a classical experiment that undergraduates who study biology and chemical industry experiment organic combination. At present,every university teachers teach their students with wangqing-Lian's method.Through several years' teaching practice, the author has found in the process of experiment according to method, students usually find oil state matter appearing, but no real product produced, or the product is false (it's salicylic acid itself by quality test) . on the other hand, even the experiment carried through in airiness equipments, it has strong stimulating odor. Furthermore, reacted giblets would pollute environment. Therefore, the author began to put up teaching study from reacting conditions, vessel etc., and has got relatively prefect effect (that is to say, ensuring success percent of teaching and studying duplex, protecting environment, saving medicines, and strictly controlling teaching time).