A lighting apparatus, comprising: a circuit board; a lighting element disposed on the circuit board, the lighting element comprising a lighting top surface and a lighting lateral surface, the lighting lateral surface adjoined to the lighting top surface and the circuit board, the lighting top surface having a center and an optical axis, the optical axis passing through the center; and a lens structure covering the lighting element for receiving a light from the lighting element, the lens structure comprising an outer surface, the outer surface comprising a total reflection portion and a light outgoing portion, the optical axis passing through the total reflection portion, the light outgoing portion surrounding the total reflection portion, the total reflection portion being configured to totally reflect a portion of light from the center, the light outgoing portion being configured to allow another light from the center to leave away from the lens structure, characterized in that, the total reflection portion satisfies: ∠ Q 2 ⁢ Q 1 ⁢ Q 3 = arctan Δ ⁢ R 1 R 1 • Δ ⁢ θ 1 > arcsin 1 n, wherein Q1 is a first point on the total reflection portion, and Q2 is a second point immediately adjacent to the first point, and Q3 is a third point located on a connection line connecting the second point and the center, and a connection line connecting the third point and the first point is perpendicular to a connection line connecting the center and the first point, R1 is a distance from the center to the first point, Δ R 1 is a distance from the second point to the third point, Δ θ 1 is an included angle defined by the connection line connecting the first point and the center and the connection line connecting the second point and the center, and n is a refractive index of a material of the lens structure. a circuit board; a lighting element disposed on the circuit board, the lighting element comprising a lighting top surface and a lighting lateral surface, the lighting lateral surface adjoined to the lighting top surface and the circuit board, the lighting top surface having a center and an optical axis, the optical axis passing through the center; and a lens structure covering the lighting element for receiving a light from the lighting element, the lens structure comprising an outer surface, the outer surface comprising a total reflection portion and a light outgoing portion, the optical axis passing through the total reflection portion, the light outgoing portion surrounding the total reflection portion, the total reflection portion being configured to totally reflect a portion of light from the center, the light outgoing portion being configured to allow another light from the center to leave away from the lens structure, characterized in that, the total reflection portion satisfies: ∠ Q 2 ⁢ Q 1 ⁢ Q 3 = arctan Δ ⁢ R 1 R 1 • Δ ⁢ θ 1 > arcsin 1 n, wherein Q1 is a first point on the total reflection portion, and Q2 is a second point immediately adjacent to the first point, and Q3 is a third point located on a connection line connecting the second point and the center, and a connection line connecting the third point and the first point is perpendicular to a connection line connecting the center and the first point, R1 is a distance from the center to the first point, Δ R 1 is a distance from the second point to the third point, Δ θ 1 is an included angle defined by the connection line connecting the first point and the center and the connection line connecting the second point and the center, and n is a refractive index of a material of the lens structure.