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This article introduces the influence of laser's spin projection noise on the sensitivity of Cs atom magnetometer and concludes that the theoretical value of the spin projection noise is about 1.23 fT·Hz-1/2 under the optimization conditions of the atom steam chest,namely temperature as 105℃,volume as 0.0785 cm3 and molecular density as 1.7 × 1013 cm-3.Such research has provided us with the necessary basis for the experimental study on Cs atom magnetometer.