GOPTION 中的vsize= 和hsize=选项设的值一样就是正方形了。

goption reset=all vsize=5in hsize=5in;
axis1 label=(a=90 "Weight") minor=none order=(50 to 160 by 20);
axis2 label=(j=c "Height") minor=none order=(50 to 80 by 5);

symbol value=dot color=blue cv=blue;

proc gplot data=sashelp.class;
    plot weight*height/ vaxis=axis1 haxis=axis2;
run;
quit;

在axis里设置length也行，有些区别