The dynamics of slim disk under the influence of a large-scale ordered magnetic field is investigated.The global solutions show that the radial velocity increases and the disk temperature decreases with enhancing magnetic field.The fraction of mass loss becomes smaller when the accretion rate is higher.The ratio of the jet kinetic power to disk luminosity is less than 0.1,which indirectly supports the argument that radio-loud narrow-line Seyfert 1 galaxies share similarities with blazars.