The three key technical problems have be met in developing the continuous sweep-ing angle of attack test technique in 2 .4m transonic wind tunnel.First,it is difficult to compen-sate transonic flow field quickly and accurately because of persistent disturbances.Second,it is difficult to filter and denoise test data because of overlapped frequencies of useful and disturbing signals.Third,it is difficult to synchronize test data because of actual signals being not synchro-nized.In order to solve these problems,a series of research and development were carried out. Quick compensation of flow field is achieved through optimizing PID(Proportional Integral Differ-ential)parameters and optimizing filter of total and static pressure signals.Test signals are de-noised through a combined filtering approach of software,hardware and wavelet.Cross-correla-tion function is used in synchronizing wind tunnel test signals.Based on above research work,the technique of continuous sweeping angle of attack for force measurement test in 2 .4m transonic wind tunnel was achieved.This technique is verified through J7 calibration model,and test re-sults show that the technical problems mentioned above are solved effectively.Mach number con-trol precision has reached ±0.002 and the results have good consistency with those of conven-tional pitch-and-pause testing mode.