Quite a number of numerical computation works contributed to the atmospheric acoustic propagation emerging constaatly in recent years make the formation of a new developing sub-branch "Computational Atmospheric Acoustics" become just round the corner. The present paper provides a brief, clear, systematic and comprehensive introduction to this brandnew field and gives a relatively exhaustive demonstration of its main objects and methods,especially the parabolic equation (PE) method, the fast field program (FFP) and the Gaussian beam (GB) approach-may be regarded as a modified ray tracing procedure. A discussion concerning the comparison among the results obtained by these various methods cannot be included due to the limitation of space j some opportunity for publishing these interesting material separately would be expected.
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