A simple analytic model has been made to describe the radio appearance of nonspherical stro¨mgren region(e. q. comet-shaped H II region), assuming that(1) ionizing photons are conserved to a given solid angle within which they are emitted, and (2) a supersonic motion of a surrounding medium creates a shocked region in front of the non-spherical Sro¨mgren region. On the basis of this calculation, a model for the cometary H II region G34. 3+0.2 has been constructed to obtain dynamical parameter of the surrounding medium(V=100㎞/tsec at a_0=1㎞/sec)with a value of n_u=103㎝^(-3). The theoretical radio appearance of the model reproduces both the emission maximum at' the head part and the dominant shell structure as the radio observation of G34.3+0.2 has displayed.

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