The tropospheric nitrogen dioxide over the Olympic venues in Beijing was measured by ground-based multi axis differential optical absorption spectroscopy (MAX-DOAS) during the Olympic Games in 2008, and was compared with the result of OMI. It showed that the result of MAX-DOAS was higher than that of OMI, the maximum is 2.4 times the result of OMI; both instruments had good accordance([EQUATION]=0.64) when it’s clear, and when it was rainy or cloudy there was more different between the results of both instruments for the existing of cloud, with a correlation coefficient of 0.19, but the result of MAX-DOAS had better accordance with LP-DOAS, with a correlation coefficient of 0.92.