The experiment of transistor amplification circuits is one of basic experiments of analog electronictechnology.Amplitude and phase frequency characteristics curves are obtained based on Multisim.There are twophenomena that are inconsistent with theory : upper limit cutoff frequency is much greater than theoreticaestimated value ;'The second is phase characteristic curve undergoes a phase transition from - 180° to 180° at acertain firequency.Regarding the first phenomenon ,the test data was processed using Python , and it was foundthat theoretical and simulated values of the lower limit frequeney of the amplitude frequency characteristic werebasically consistent with test values ,;The upper frequency is between theoretical value and simulation value. Inresponse to the second phenomenon, a theoretical phase frequency characteristic curve was drawn usingPython ,and the Lissajous plots were measured no phase jump.