An nearinfrared imaging system was designed by using the acoustooptic tunable filter (AOTF) as the spectroscopic devices and FPA640×512 InGaAs focal plane array detector as the sensitive optical receiving device．The system consists of three parts including of a radio frequency driving source module，AOTF optical module and array detector imaging module．First, the operating principle of AOTF was introduced, and the high frequency signal generating circuit and power amplifier for driving AOTF to diffract different light wavelength were designed based on the principle. The detector imaging module used FPGA as the core processing unit, received the rising edge signal from the RF driven synchronous interface circuit，then generated the time sequence for detectors to work，finally restored the image through the data acquisition and storage module．The nearinfrared imaging system was set up. The experimental results showed that the image quality was very clear in the near infrared wavelength range of 0.9～1.7 μm，which has a high application value．