One Piece in China

Taiwanese Dub
The Taiwan Dub of One Piece (called "航海王" or "King of Navagation" in english) began to air on TVB in China around 2000. The dub is uncensored and the openings are left in Japanese. A new epsiode currently airs every week on TTV and is usually very close to the Japanese version (usually 20 or so epsiodes away from the current Japanese epsiode). All of the movies (except Stong World) have been dubbed in Taiwanese as well.

Here's TTV's website for One Piece

Cantonese Dub
The Cantonese Dub aired in Hong Kong sometime in 2000-2001. Only 1 Sesson was aired as the reception was poor. The name of the Cantonese version is called 海盗王 “Pirate King”.

===='''Chinese Dub

'''==== The Chinese Dub aired in Mainland China sometime in 2001-2003. Only 2 sessons was aired, the 3rd sesson was also aired, but it stopped halfway to makeway for another anime that was from China itself. The name of the Chinese version is called 海贼王“Pirate King”.