The invention discloses a lens which can cover multiple light sources, wherein the plane including said multiple light sources is an installing surface, and the lens is extended along a direction parallel to the installing surface and comprises an in-light surface to form the inner profile of the lens and an out-light surface to form the outer profile of the lens; the cross section of the lens perpendicular to an extension direction is arranged in bilateral symmetry, and the in-light surface is a concave curved surface and forms a sunken part which can accommodate the multiple light sources; the incident light of the lens and the optical axis of the light source form an included angle (I) and the emergent light and the optical axis of the light source form an included angle (gamma); when gamma is equal to a constant value (zeta), the corresponding (I) is equal to the constant value (epsilon), the tangent line of the emergent point of the corresponding emergent ray and the installing surface form the included angle (theta) which is equal to the constant value (phi) no more than 90 degrees, the emergent point of the corresponding emergent ray is on the outer profile of the cross section, and the tangent line of the emergent point is on the outer profile. According to the lens, batwing light distribution can be realized.