  Momentum distributions of quarks/gluons inside a light baryon in a hard
exclusive process are encoded in the light-cone distribution amplitudes
(LCDAs). In this work, we point out that the leading twist LCDAs of a light
baryon can be obtained through a simulation of a quasi-distribution amplitude
calculable on lattice QCD within the framework of the large-momentum effective
theory. We calculate the one-loop perturbative contributions to LCDA and
quasi-distribution amplitudes and explicitly demonstrate the factorization of
quasi-distribution amplitudes at the one-loop level. Based on the perturbative
results, we derive the matching kernel in the $\overline{\rm MS}$ scheme and
regularization-invariant momentum-subtraction scheme. Our result provides a
first step to obtaining the LCDA from first principle lattice QCD calculations
in the future.
