  The sea quark contributions to the nucleon electromagnetic form factors from
up, down and strange quarks are studied with the nonlocal chiral effective
Lagrangian. Both octet and decuplet intermediate states are included in the one
loop calculation. Compared with the strange form factors, though their signs
are the same, the absolute value of the light quark form factors are much
larger. For both electric and magnetic form factors, the contribution from $d$
quark is larger than that from $u$ quark. The current lattice data for the
light-sea quark form factors are between our sea quark results for $u$ and $d$.
