The dependences of OAO fluorescence on space and time are investigated by using a time and space resolved method. The notable effect of the geometrical shape of the sample cell on OAO fluorescence is observed. A pulse acoustic wave and its relationship with OAO flurescence are recorded. It shows that the excited BC13 molecules are excited again becase of the action of the pulse acoustic wave By using of a simple model, the generation of OAO fluorescence and its axial shift are analysed. The calculated results are in agreement with the experimental data.