<正> The correctors will be used in the correct system of CSRm. The required parameters are shown in Table 1. The normal section of the correctors has two different types, one is bidirectional corrector, the other is only vertical directional corrector. In CSRm, the space for the correctors is narrow, the homogeneity (△B/B) should be under ±1×10-2, and the good field region is large relatively. In order to obtain such a magnetic field, the profile of the magnet should be calculated carefully. As shown in Fig.l, there is the distributing of the vertical