The effect of structural parameters of solenoid pulsed magnet on magnetic field is studied, including the number of turns, the number of coils, the distance between multi-coils and stainless steel cylinder. Under the condition that the capacitor storing energy and the voltage which supplies power are both constant, the amplitude of magnetic flux density is reduced and the fluctuation of magnetic field lines is increased contrarily when increasing the distance between multi-coils, but the total current reaches its peak earlier. Increasing the number of turns in each coil can obviously reduce the peak of total current and thus the amplitude of magnetic flux density. However, it is beneficial for reducing the fluctuation of magnetic field lines. With the increasing of coils number, the length of uniform magnetic field region becomes longer, the amplitude of magnetic flux density is reduced with constant supplied energy, and the total current reaches its peak earlier. On the whole, when the length of uniform magnetic field region is constant, decreasing the number of turns and increasing the number of coils are both effective ways to obtain a stronger magnetic flux density and better uniformity. But it is limited by the capacity of the coils to carry current. In addition, the stainless steel cylinder causes the distribution of magnetic field to be asymmetrical, and the amplitude of magnetic flux density reaches its peak later than the total current does.