To solve the problems of Gantry therapy device met—huge magnet weight, expensive operation, this paper proposes a new type of coil structure based on tilted solenoids. We have completed a 2.5 T NbTi superconducting magnet prototype design for heavy ion Gantry. The design can reduce the gantry’s size and weight and make it more comparable with gantries used for proton therapy. The magnet consists of ten layers of tilted solenoids with operating current of 1000 A. The coil clear bore is 176 mm and the good field region can be up to 2/3 of the aperture. Because of the magnet’s special shape, it doesn’t require optimization and the higher order harmonics naturally integrating to zero through the ends. To ensure magnet safe and stable operation in the case of rotation, it uses the conduction cooling form. From the concept of tilted solenoid coil,Sthe magnetic field design is reported in detail. Based on ANSYS thermal FEM software, we simulate the temperature profiles inside the magnet and the thermal shield and obtain the thermal distribution of magnet cryogenic system. Finally, we give a brief introduction about the magnet processing.