  We present preliminary results for the kaon semileptonic form factors using
the PACS10 configurations, whose physical volume is more than (10 fm)$^3$ at
the physical point with the lattice spacings of 0.085 and 0.064 fm. The
configurations were generated using the Iwasaki gauge action and $N_f=2+1$
stout-smeared Clover quark action. For the continuum extrapolation, we
calculate the form factors with the local and conserved vector currents. The
form factors in the two lattice spacings are extrapolated to the continuum
limit using a fit function based on the NLO SU(3) ChPT formula with terms
corresponding to finite lattice spacing effects. The value of $|V_{us}|$ is
determined using our preliminary result of the form factor at the zero momentum
transfer in the continuum limit. The result is compared with recent lattice
results, and also predictions of the standard model from the unitarity of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix.
