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Atmospheric CO2 concentration was continuously measured at shangri-la background station by Cavity Ring Down Spectroscopy system from September 2010.The average background concentrations during spring,summer,autumn and winter were 394.78×10-6(mole ratio,the same below),386.82×10-6,386.46×10-6 and 390.74×10-6,respectively.The monthly average variation reached a maximum m April-May period and a minimum in July with the amplitude to be about 12.22×10-6.