A head lamp assembly, comprising: a rotation control unit for determining irradiating directions of a pair of head lamps individually controlled; a lighting unit provided in each of the head lamps to generate light; a shield unit located at the front of the lighting unit to be rotatable on a rotary shaft and having a plurality of shield protrusions (230, 232, 234, 236, 238) for partially intercepting the light; and a shield operating unit for rotating the shield unit to displace the plurality of shield protrusions (230, 232, 234, 236, 238) to desired locations and thereby activate a selected shield protrusion so as to form a predetermined beam pattern corresponding to surrounding situations, wherein the plurality of shield protrusions (230, 232, 234, 236, 238) have different shapes from each other, wherein a part of the plurality of shield protrusions (230, 232, 234, 236, 238) have steps, wherein the plurality of shield protrusions (230, 232, 234, 236, 238) include a first shield protrusion of which a step starting portion protruding upward is formed in a middle point in the length direction of the shield, and a second shield protrusion of which a step starting portion protruding upward is formed biased toward the step from the middle point, so that the starting location of the steps of the first and second protrusions (232, 238) are different from each other, the headlamp assembly being controllable to form beam patterns including class C pattern for country roads, class V pattern for down-town, class E pattern for highways, class W pattern for in-rain driving, and wherein the beam pattern of class W is formed by activating one of the plurality of shield protrusions (232, 236, 238) having a step at one head lamp of the pair of head lamps and activating a third shield protrusion having no step at the other head lamp of the pair of head lamps, and wherein the beam pattern of class W is formed by rotating the pair of headlamps in opposite directions around a vertical axis, and by increasing a light power supplied to the lighting unit of one of the head lamps and by decreasing a light power supplied to the lighting unit of the other of the head lamps. a rotation control unit for determining irradiating directions of a pair of head lamps individually controlled; a lighting unit provided in each of the head lamps to generate light; a shield unit located at the front of the lighting unit to be rotatable on a rotary shaft and having a plurality of shield protrusions (230, 232, 234, 236, 238) for partially intercepting the light; and a shield operating unit for rotating the shield unit to displace the plurality of shield protrusions (230, 232, 234, 236, 238) to desired locations and thereby activate a selected shield protrusion so as to form a predetermined beam pattern corresponding to surrounding situations, wherein the plurality of shield protrusions (230, 232, 234, 236, 238) have different shapes from each other, wherein a part of the plurality of shield protrusions (230, 232, 234, 236, 238) have steps, wherein the plurality of shield protrusions (230, 232, 234, 236, 238) include a first shield protrusion of which a step starting portion protruding upward is formed in a middle point in the length direction of the shield, and a second shield protrusion of which a step starting portion protruding upward is formed biased toward the step from the middle point, so that the starting location of the steps of the first and second protrusions (232, 238) are different from each other, the headlamp assembly being controllable to form beam patterns including class C pattern for country roads, class V pattern for down-town, class E pattern for highways, class W pattern for in-rain driving, and wherein the beam pattern of class W is formed by activating one of the plurality of shield protrusions (232, 236, 238) having a step at one head lamp of the pair of head lamps and activating a third shield protrusion having no step at the other head lamp of the pair of head lamps, and wherein the beam pattern of class W is formed by rotating the pair of headlamps in opposite directions around a vertical axis, and by increasing a light power supplied to the lighting unit of one of the head lamps and by decreasing a light power supplied to the lighting unit of the other of the head lamps.