I need to ship some boxes from China to Switzerland this summer and a friend has suggested the following company:

http://www.sevenseasworldwide.com/

Apparently, they even provide boxes and packaging. Not sure how their prices compare with other companies, so I will be interested to see whether you get any other feedback!

I will find a Chinese friend who can translate and visit China Postal Services and inquire there.  As long as you do not send anything forbidden, and you "register" the box, I have had very good luck with them, and their land service is dirt cheap.  But it will take 2 to 3 months to get there.  To register the last box was about 10 or 15 yuan extra.

Thanks to all for your advices. I also asked China Post, and their price is quite acceptable, providing it's for sea shipping. Otherwise, it's pretty expensive. 

I recently used allen.zheng@antsrelo.com      ,they moved all my gear from Dalian to Beijing even my 1 metre long model ships & broke nothing , reaaly good , prompt and on time 

China Post Office for sure, surface delivery.  It will take about 2 - 3 months to reach Europe but it is relatively expensive.

Their website is also available in English -- look here please:

http://english.chinapost.com.cn/