Optofluidics chips have the advantages of miniaturization,integration,and reconfigurability.The technique on actuation of liquid often becomes the bottleneck in the research of optofluidics.The property of minim liquid is different from that of bulk liquid,so new techniques on actuation of liquid using microcosmic characteristics are researched.They are more miniaturizing,integrating and flexible than the macro-techniques.Some new techniques by using surface tension,heat,radiation pressure,Marangoni convection,magnetic field,and the interaction between liquid and electromagnetism on actuation of liquid of optofluidic chips are described.