Here, we investigate the influence of radiation pressure from massive stars and clusters on KH instabilities in the interface between HII region and molecular clouds. The stability of the interface between HII region and molecular cloud in the presence of radiation pressure has been studied using the linear perturbation analysis in a certain range of wavelengths in which the growth rate is high. A linear analysis shows that the radiation pressure has a destabilizing effect on the growing KH modes and decreases the e-fold time scale of instability, specially in small perturbations. Based on our results, the radiation pressure is a triggering factor in the development of KH instabilities and subsequently formation of turbulent-structures.

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