Vertical space characteristics of infrared hyperspectral hyperspectral atmospheric sounder data are indirectly determined by spectral performance indicators of the sounder, and are related to the interested atmospheric parameter and its variation. Based on removing those invalid channels whose atmospheric parameter sounding signal-to-noise are too low, the sounding altitude, sounding altitude resolution, sounding vertical asymmetry and sounding vertical coverage of water vapor and ozone are evaluated for FY-4A satellite infrared hyper-spectral atmospheric sounder GIIRS data. Then, they are compared with the vertical space characteristics of atmospheric temperature sounding. The results show that, 1) similar to atmospheric temperature, FY-4A GIIRS can sound the vertical distribution of atmospheric water vapor, where the vertical coverage of water vapor sounding is troposphere lower than 12km (the sounding peak altitude is below 11km), and atmospheric temperature can sound the entire troposphere and lower-and-middle stratosphere. 2) FY-4A GIIRS can sound total ozone in 10～21 km, and the sounding altitudes are distributed concentratedly near 16.4 km. This study is helpful to grasp the application ability of FY-4A GIIRS infrared hyperspectral data from the perspective of sounding vertical space characteristics.