This paper proposes a novel method of optothermal microactuating based on dual laser beams (spots).An optothermal microactuator (OTMA) with a 100μm-width expansio n arm and 750μm-length is designed and manufactured by using an excimer laser micro machining system.Experiments are carried out on the OTMA using dual laser beams with 650n m wavelength,which are monitored by the CCD microscopic system.The results show that the deflection-power curves exhibit approximate linear relationship between the opt othermal deflection of OTMA and the power of laser spots.Furthermore,when the total power is 4mW,the optothermal defletion caused by dual laser spots reaches 15.2μm,larger than the sum (13.1μm) of those individually caused by the left and right laser spots.Meanwhile,as the power density of dual spots is only half of that of single spot when obtaining the same deflection,this method can effectively avoid burning-out and damage of OTMA,and thus OTMA′s working lifetime can be significantly exten ded. The method of optothermal microactuating is of the advantages of simple structur e,easy fabrication,large displacement,convenience for operation,and enables wireless and remote control.It has high potential of being widely applied in the fields of micro/na no-technology and micro-opto-electro-mechanical systems.