  In this paper, we investigate the 1/4 BPS Wilson-'t Hooft loops in
$\mathcal{N}$=4 supersymmetric Yang-Mills theory. We use the bulk D3-brane
solutions with both electric and magnetic charges on its world-volume to
describe some of 1/4 BPS Wilson-'t Hooft loops. The D3-brane supersymmetric
solutions are derived form requiring $\kappa$-symmetry. We find the two
consistent constraints for Killing spinors and calculate the conserved charges
of straight 1/4 BPS Wilson-'t Hooft loops and expectation values of circular
1/4 BPS Wilson-'t Hooft loops separately.
