The noise of the cold atom gravimeter is analyzed using the sensitivity function analysis method, and then based on the corresponding noise transfer function, a noise transfer model is established and the contribution of vibration noise, Raman optical phase noise and magnetic field noise to the sensitivity of gravity measurement is quantitatively analyzed and evaluated. In addition, based on the correction formulas of Coriolis force and stable platform tilt angle, a system effect analysis model is established, and the influence of heading angle deviation, speed deviation and latitude deviation on the correction of Coriolis force is quantitatively analyzed and evaluated, as well as the influence of the tilt angle deviation on the correction of stable platform tilt angle. Simulation and some measured data show that, on the one hand, when each noise is restricted to a specific level, the influence on the sensitivity of atomic interference can still reach μGal level. On the other hand, 1°heading angle deviation or 0.1 m/s speed deviation can affect the correction of Coriolis force to more than 1 mGal, and 1' tilt angle deviation can also affect the correction of stable platform up to 0.42 mGal, indicating that both effects of noise and system effects cannot be ignored. Therefore, under dynamic conditions, the cold atom gravimeter should undergo noise suppression and system effect correction to obtain high-sensitivity and high-precision gravity measurement results.