This research investigates the impact of language switches or code-switching on ad effect.Based on the Markedness Model,it demonstrates that the code-switching direction effect of the ad using the mix languages; specifically it finds that the ad effect of the ad slogans written mostly in native language and switched to advantageous foreign language is more superior over that of the ad slogans written mostly in advantageous foreign language and switched to native language.Further,this research illustrates that attitude towards code-switching impacts bilinguals responses to code-switched ad.