Thanks.
I just couldn't find a climate there. Ive read terrain is 800-2000m mountains and could be cold .

Anybody has experience with traveling to Lao ( north ) this time of the year? Im thinking of going to Luang Nam Tha. What is the best way to get there? Bus to Mengla and transfer or take bus to KM-LPrabang and get off in Na Toei? Just dont want to get off in some small time in the middle on the night and looking for hotel.

where South exactly?

if u apply for biz visa, I guess u r loosing your Married visa. U cant be here on 2 types of visas I guess. Biz visa requires leave mainland every 2 months so. If u r in GZ or SZ,its ok to go to HK make Uturn on 2 stops in train, but since u r in KM I guess its bit hassle. As Johanes says: Married visa is good enough. U have to put down biz on your wifes name. Work visa is only trought the certain employer, which means again your whife would have to set up the company and employ U, which means pay some extra tax for employing the foreigner ( 20-30k RMB per year Ive heard ). JV program I have no idea, but as far as I know, its about bigger companies etc.