Abstract：The influence of binary evolution on the structure of the companions of Type Ia supernovae (SNe Ia) is investigated in the paper.It is found that, compared to a single star, the companions have a more expanded envelope and a larger radius.The influence on their motion after supernova explosion at the stage of the comapnions when mass transfer begins is studied.We found that if the mass transfer begins at main sequence stage, the orbital velocity of the companions may be changed by explosive ejecta more likely than that during Hertzsprung-gap.

Keyword：stars-binary evolution;stars-white dwarf;stars-supernova-general;