The design method of the drive circuit of 320×240 uncooled infrared focal plane array (UFPA) and circuits of converting the analog output of UFPA to digital signal are proposed. Xilinx's XC9500 Series complex programmable logic device is adopted to design the timing circuit so that the drive circuit could be made in miniature design. It's flexible and easy to use VHDL language to design and make change in the research progress. TI's A/D converter THS1408 is used to convert the 5.5M analog output of UFPA to digital signal right after the UFPA, so that the transfer disturbance is greatly reduced. This paves the way for the production of 320×240 staring uncooled IR thermal imager in China.