Thank to all who answered my questions before. 
As the title suggests, how do I get the correct page numbers? 
For example, in the example below, 
the first line on the 2nd page, but the page number showed is 1,
In the meantime, I tried using \definepagestate, 
but it didn't seem to work either. 
What I can think of is to use citations to get the correct page number. 
But it seems that what is obtained is not a pure number, 
and it cannot do the calculations.

so ,how do I get the correct page numbers and do the calculations with it?

thanks.
%%%%%% start example
\starttext
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% try page state
\definepagestate[test][delay=yes]
\newcount\test
\let\testfloatrealpage\realpageno
\def\testsavedata
  {\setpagestate[test][\number\test]}
\def\testloaddata % precedes save !
  {\global\advance\test\plusone
   \xdef\testfloatrealpage{\pagestaterealpage{test}{\number\test}}
   \ifx\testfloatrealpage\empty
    \glet\testfloatrealpage\realpageno
   \fi}
\testsavedata%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\dorecurse{10}{%
\testloaddata%
\input knuth \pagereference[XX:#1]
{\ssd\color[red]{\the\pageno}}%           on page 2 and show page 1
{\ssd\color[red]{\the\testfloatrealpage}}%on page 2 and show page 1
{\ssd\color[red]{\ref[page][XX:#1]}}%     on page 2 and show page 2
}
\stoptext
% stop example

                                                                          Muyik
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