as I know,

People in the UK use the term high street the way Americans use the phrase Main Street.
so the high street is the main commercial and retail street in a town
and frankly I'm not sure )) beside I don't if that helps or not but I gonna make it clearer with few exampls such as
Shanzeliza is one of most popular streets "high street" in the world

Oh,Thanks for you guys. Because of your explain, i can undertand the mean of this Phrase.

I found this: http://gouk.about.com/od/shopping/f/HighStreetFAQ.htm

It's definitely not used in Australia, but it (apparently) is in the UK.

Thanks,Jamt. But this phrase appear in my textbook,and my English tutor explain it like ' customer can touch product in the store' . I'm  just not sure the meaning.

It's not a phrase I've ever heard. It probably refers to a store on a street called High Street.