Floating figures and tables can move past \newpage, so what is happening is that the \newpage does start a new page, then inserts the figure, then starts the references section.

You want \clearpage, which has the same effect as \newpage but restricts floats as well. If there are pending floats when \clearpage hits, a float page is created only after which the content will continue.

Moreover, if you're writing a document with the 'twoside' and 'openright' options (e.g. a book), you want to use \cleardoublepage

源自：http://tex.stackexchange.com/questions/2958/why-is-newpage-ignored-sometimes