提出了一种产生长距离、高质量贝塞尔光束的新型光学元件——线性径向梯度折射率透镜(LRGIL)。从几何光学角度和衍射积分理论分析了LRGIL 产生贝塞尔光束的原理，用软件进行模拟，得出LRGIL 具有传统轴棱锥功效的结论。用Math CAD 模拟LRGIL 产生长距离贝塞尔光束，得出变化LRGIL 的厚度和折射率曲线参数容易改变其产生光束的无衍射距离，并得到了无衍射距离大于3 m 的贝塞尔光束。此外，LRGIL 还有诸多优点，如不易损坏，更加灵活等，在实验和生产中拥有极大的开发潜力。

A new optical component named linear radial gradient-index lens (LRGIL) for generating Bessel beams with long non-diffracting distance and high beam quality is proposed. Based on the geometrical optics and the diffraction integral theory, the principle of LRGIL generating Bessel beams is analyzed. Using Math CAD to simulate the beam propagation process, LRGIL has the function of traditional axicons and the diffraction-free distance of the Bessel beam is variable with the thickness and the gradient index of LRGIL. A long diffraction-free distance up to 3 m is also obtained in the simulation. Besides, LRGIL has other advantages such as more durable and flexible, it has great potential applications in experiment and production.