The conventional particle-moving algorithm for particle-in-cell simulation of plasma is investigated by numerical experiments

which are conducted in three typical fashions of the charged particle motions in electromagnetic fields

that is

cyclotron

drift and spiral drift. The origins of numerical error are identified

and then eliminated by correcting the cyclotron coefficient and half-accelerating coefficient of the finite difference scheme. The corrected algorithm not only improves the accuracy but also relaxes the time step condition for the simulation. It can increase the computation efficiency

especially for large-scale plasma devices with strong magnetic fields.