Abstract: Migration, conventionally, being an important part of demography, is least studied as compared to fertility and mortality. Due to decreasing birth and death rate, migration (internal or international) has become a more important concern for demographers and other social scientists.Since probability models provide concise and clear representations of extensive data sets in a better way (Aryal, 2010),in recent years increased attention has been paid to the proposition and derivation of probability models for the movement of human population at micro level. The aim of the paper is to study the pattern of rural out migration with the help of a probability model. The data for the study have taken from two different places. The study shows that the logarithmic series distribution is a well approximation for the rural out migration in the given area.