Using a single highly focused fundamental-mode Gaussian beam could form an optical tweezer and load atoms,although optical tweezers generally choose to far away from the atom resonance transition line of the laser, optical tweezers intensity fluctuations will also lend to the atoms’ escape,so the lifetime of the atom in optical tweezers becomes crucial.In this experiment, acoustic optical modulator was used as the main component, and a set of external feedback control circuit was added to suppress the intensity noise in frequency domain and power fluctuation in time domain of 937.7 nm optical tweezers,reducing the heating parameters of atoms in optical tweezers, so as to effectively extend the trapping life of atoms in optical tweezers.The typical bandwidth is 17 kHz,noise suppression is 10 dB, and the time-domain laser intensity fluctuation could be reduced from a peak-to-peak fluctuation of ±1350％ to ±0036％, effectively reducing the intensity fluctuation of optical tweezers. The experimental results showed that the trapping lifetime of single cesium atom in 937.7 nm optical tweezers could be extended from 200 ms to 1 180 ms.It provides sufficient time for the subsequent preparation and excitation of atomic states, ensures the capture of atoms, improves the success rate of experiments, and saves the time of experiments.