Abstract: The maximum entropy principle is a basic law of nature,which is used to study the distribution of mixed ideal gas molecules along height in the gravitational field,the probability density distribution of molecule of each component gas is obtained,the relationship which shows how molecular number density of each component changes with height.In terms of the Monte Carlo method,computer simulation experiment is performed for studying the distribution of mixed ideal gas molecules in the gravitational field.The simulation result is compared with the theoretical one,and it is found that they are in good agreement with each other.This demonstrates that the theory is successful and the computer simulation adequately reflects the actual situation in mixed gas.

Key words: maximum entropy principle, computer simulation, mixed ideal gas, gravitational field