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The discovery of the two dimensional electron gas(2DEG)at the interface between two band insulators LaAlO3 and SrTiO3 has triggered intensive researches on this system,and intriguing electronic properties have been found in this heterointerfaces and the significant results promise the potential application in the new generation of electronic devices.In this interfacial 2DEG system,the transport properties of the LAO/STO interfacial conducting states are extremely sensitive to the surface state of LAO surface,and the modulation of surface state has been shown to have a great influence on the transport properties of the interfaces.In this work,we report the LAO/STO surface modulation by means of polar liquids and metal nanoparticle induced giant photocurrent effect.