The shape memory effect(SME) of TiNi alloy was studied using the method of factorial design analysis.Five potential factors were chosen in the experiment,which were sample dimension,heat treatment temperature,heat treatment time, cooling rate and training times.A high level value and a low level value were assigned to each factor.The inverse martensitic transformation finishing temperature A_f was chosen as the observed value.The results show that the heat treatment temperature has the most significant effect on A_f,while the sample dimension and cooling rate a less significant effect,and the heat treatment time and training times the least.