Disclosed are a method and apparatus for expressing a seeding line for artificial enhancement of rain in airborne experiments considering cloud water. The method includes calculating average cloud liquid water path (LWP) for each time zone in a target region based on numerical weather prediction (NWP) model data for the target region, calculating an average wind direction and wind velocity in the target region, calculating a middle point and left and right end points of a seeding line candidate which is based on the average wind direction and wind velocity, calculating a seeding line by correcting the seeding line candidate based on a point at which cloud liquid water contents (LWC) is a maximum within upper, lower, left and right selection regions around the middle point and a height at the point, and expressing the seeding line and the height of the seeding line as an optimal seeding line and seeding height if the maximum value of the LWC is greater than 0.
