Poly crystals of pure thiourea an organic material: have been grown by slowevaporation technique at room temperature .The crystalline nature of grown crystalwas confirmed by functional group of the grown crystals was found by FTIR analysis.The spectral bands have been compared with similar thiourea complexes using FTIRspectrum in the range 1000- 3500 cm-1 .The UV- Vis study was performed to knowoptical behaviour of the grown crystals.