The self-made ground-based multi-axis differential optical absorption spectroscopy(MAX-DOAS)is introduced. Two-dimensional CCD array is used in this system, which enables the images of optical signals obtained from different elevation angles distributing in different area in CCD. Thus it is possible to be detected simultaneously for atmospheric trace gases from different elevation angles. The performances of the detector and imaging spectrometer, such as offset, dark current, noise, linearity, resolution, wavelength range, are tested.Monitoring results of O₃ from different angles are presented. Results show that the MAX-DOAS system can satisfy the need of atmospheric monitoring.