Objective:A new method was established to analyze and evaluate the progress of asthma based on the biological signal acquisition and processing system,which was used to observe the anti-asthmatic effects of Maxing Shigan decoction.Method: The biological signal acquisition and processing system was used to record the difference of breath wave before and after asthma induced by histamine phosphate,asthmatic latency and duration was recorded by the routine method at the same time,amplitude variations between t...