The control of lasers is one of the most important subjects in optics. In this paper, we investigate the propagation behavior of three ring Airy beams (RABs) with an equilateral triangle arrangement. The visualized intensity distribution of RABs array exhibits two types of autofocus: 1. sudden autofocus, which can be applied in producing laser bullets; 2. triangle autofocus, which can be used as laser-tweezers. The properties of laser bullets are investigated. The results reveal that the center intensity (position) of laser bullets increases (decreases) in a power-law way versus initial RABs' intensity. Moreover, we discuss the range of parameters to produce laser-tweezers with the best quality. Since the position and power of the RABs-bullet and RABs-tweezers can be controlled with high precision, it has important application value in many fields such as laser targeted therapy of cancers, manipulation of microscopic objects, photoresist technology in chips and so on.

激光的控制是光学中最重要的课题之一。在本文中，我们研究了等边三角形排列的三个环形艾里光束 (RAB) 的传播行为。RABs阵列的可视化强度分布表现出两种自动对焦类型：1.突然自动对焦，可用于生产激光子弹；2.三角自动对焦，可用作激光镊子。研究了激光子弹的特性。结果表明，激光子弹的中心强度（位置）相对于初始 RAB 的强度以幂律方式增加（减少）。此外，我们还讨论了生产质量最好的激光镊子的参数范围。由于可以高精度控制RABs-bullet和RABs-镊子的位置和功率，