Strong stimulated radiations at wavelengths 3740 A have been observed when PbCl2 molecules are photodissociated by 2660 A ultraviolet laser. Dependences of these radiations on the pump laser intensity and PbCl2 molecular density have been studied experimentally. A theoretical model to describe these processes is put forward. These two raditions are identified as resonant laser radiation and stimulated Raman scattering originated from bhe population of the metastable level 6p23P2 of atomic Pb, which is produced by two-photon dissociation of PbCl. When molecular density of PbCl2 ig 6.21×l0 16cm-3, the maximum populations on the two metastable levels, 6p2 3P2 and 6p2 1D2 of atomic Pb are almost same, which equals 2.0×10 16 cm-3.