The structure design and simulation research for the water-cooled solenoid with magnetic field on the order of T are presented in this paper. The multi-layer water-cooled structure design is used for the solenoid. The solenoid structure malformation caused by different temperature rise is simulated and checked. Finally the magnetic field is calculated by POISSON code. The structure deformation is less than 0.07 mm with 60 ℃ temperature rise and the magnetic field is 1.5 T with 96.6 A current.The axial magnetic field region is 40 mm on the order of 0.01% precision and is 140 mm on the order of 0.1% precision. The results show that the water-cooled solenoid is good enough for the magnetic field calibration measurement.