blogger to wordpress, need help

Im going to move my site from blogger blogspot to wordpress.I have already using my own domain with the blogspot http://www.mysite.com.

My question is, if i import the files and link, will it affect google traffic and serp? I have already made like 600 unique visitor aday in blogspot.

I have tested the importing step, and it didnt change its url permalink, thanks god

but anyway, Can it hurt my traffic? one thing i know is the url will not change
my blogger site is http://www.mysite.com/permalink
my wordpress gonna be like http://www.mysite.com/permalink too

any thoguht?