  The KLOE experiment has been running since April 1999 at the DAFNE e+e-
collider at a center of mass energy centered around the phi meson mass. The
luminosity integrated up to September 2002 is about 500 pb-1 . Here we present
the perspectives on the measurement of the V_{us} CKM-matrix element with the
KLOE detector, using both charged and neutral kaon semileptonic decays.
