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Photonic crystals (PhCs) are materials with periodic dielectric structure, which leads to the formation of photonic bandgap (PBG).Lasing action has been obtained by using PhCs.Herein, we demonstrate the lasing and amplified spontaneous emission in polymeric inverse opal photonic crystal resonating cavity.The resonating cavity is constructed by sandwiching tert-butyl rhodamine B doped PMMA film with polymeric inverse opal photonic crystals, which work as feedback mirrors.Laser-induced emission experiments reveal lasing or amplified spontaneous emission of the dye molecules in the resonating cavity.