We have investigated the dynamics of dust particles in electrode sheaths of dc glow discharges.The charge of dust particles,the various forces and the suspension position are also calculated.The dynamics and the suspension position of dust particles are determined by their size and the forces acting on them. We find that the suspension position in the collisional sheath is closer to the electrode than that in the collisionless sheath.It is also shown that in the lower sheath (above the lower electrode) only those particles of the same size can be suspended in the same position.In the upper sheath (under the upper electrode) grains with different sizes can be suspended in the same position.All the dust particles suspended in the sheath are charged negatively and satisfy Fnet=0 and dＦnet/dx<0.However,whether the dust particles that satisfy these conditions can be suspended in the sheath is also determined by their initial position and velocity.