  The decay $K_L \to \gamma \nu \bar{\nu}$ is investigated beyond the standard
model. Interestingly, the upper limit of the CP-conserving and CP-violating
branching ratios of the decay, induced from the possible extensions of the
standard model, would be larger than the corresponding branching ratios given
in the standard model respectively, and it is expected that the CP-violating
part could be enhanced.
