Abstract: In Reference(1), a calculation formula for gas leak position is obtained by using Laplace Transform，but its result is wrong by checking, In this paper,according to the general model, an approximate calculation formula for gas leak position and gas leak flow in pipeline networks is obtained by using asymptotic methods of Laplace Transform, This formula is simple in measurement and calculation, and is suitable for gas leak problems of complex pipeline networks.

Key words: Gas tratismission pipeline, Gas leak position, Gas leak flow