It depends on what you mean by "widescreen" -- is the expression used in relation to video (DVD) formats, or in relation to widescreen projection processes such as standard spherical widescreen (1:1.85) or anamorphic Panavision/Cinemascope (1:2.35)?
If it's the latter, then I'm sure such photographic and projection processes have been in place in China for quite some time. The US isn't the only country in the world that can claim "widescreen" projection processes as a "pioneer" of such since their inception in the fifties...
In fact, a pretty basic Google of the words "China" and "widescreen" produced the following result:
http://www.china.org.cn/english/features/film/84966.htm
Which, if you read not so far through the paragraphs within, you'll discover that China produced its first "widescreen" motion picture (in this instance, referring to the "Cinemascope" format) all the way back in
1960. Thereby, excepting the Cultural Revolution, where there were no films produced between 1966 and 1972, China first dabbled in "widescreen" format films a measly
forty seven years ago.
