> My search condition is a airport in China, But its result is not. Is
> there any parameter to restrict the result in China.

As they say above,  No.  But you can check the results to see what
country they are in and discard the ones you don't like.
http://code.google.com/apis/maps/documentation/geocoding/index.html#GeocodingResponses

> In google map api v3's doc, no api is provided for Geocoding via Http
> request.

HTTP geocoding is HTTP geocoding, is not related to v2 or v3 client-
side APIs

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