Problem with playing flash with QTWebkit 4.8.5

[Juzzy]

Dears,
I want to show flash in QTWebkit and have done the following steps
1. Code:
QWebSettings::globalSettings()->setAttribute(QWebSettings::JavascriptEnabled, true);
QWebSettings::globalSettings()->setAttribute(QWebSettings::PluginsEnabled, true);

2. export QT_PLUGIN_PATH= the directory contains the libflashplayer.so

But flash still can't show normally.

Any one can help?

Thanks,