I want to do my phd in sweden. What are the requirements to be fulfilled

I believe officially a Bachelor degree is sufficient, but in reality I think most have a Master degree. Why don't you contact the institution you're interested in? They can tell you their special requirements. All Swedish universities have English versions of their websites, so finding the contact info shouldn't be a problem.

i want to know the requirements of PhD in economics .

ifinished my bacholer degree imedical labortary in 2004/12
and iam doing master in public and tropical disease since 8/1/2005 were i will finsh in October 2006and iwish to do PhD in sweden .