As one key part of the magnetooptical trap, the magnetic system occupies an important position in high precision cold atom gyroscope. With the continuous decrease of gyroscope volume and improvement of integration, the effect of fabricating and assembly errors of magnetic system on gyroscope performance is constantly increasing. These errors will cause the magnetic field zero drift and field gradient change, reduce work efficiency and quality of cold atom clouds, ultimately affect the gyroscope performance. The main manufacturing and assembly errors of the twodimension magnetic field are selected by theoretical analysis, and the “virtual” experiments are completed via the experimental design and Ansoft simulation. Based on mathematical regression of the experimental results, the reasonable tolerance limit of key manufacturing and assembly parameters are designed and the validation of the trial manufacture is carried out. The theoretical direction for the design and manufacture of the twodimension magnetic system of the miniaturized cold atom gyroscope are provided.