Aiming at the situation that the small target detection method is greatly affected by the signal-to-noise ratio,this paper proposes a spatio-temporal joint small target detection method,which uses the gray feature,gradient feature,and motion feature of the target to achieve the detection of the small target,and the hardware implementation is completed on the FPGA platform.Experimental results show that the algorithm proposed in this paper has high detection accuracy and good real-time performance,and can realize real-time detection of small infrared targets.