We study the long distance contribution to K+ --> pi(+)<nu(nu)over bar> by using chiral perturbation theory. We find that the tree level O(P-2) contribution vanishes identically without assuming the large N-c limit. The leading contribution arises from the one-loop amplitude, which is O(P-4) in the chiral power counting. The branching ratio of the long distance contribution is found to be of order 10(-7) smaller compared with that of short distance one and hence is completely negligible.
