Regional energy focusing is a crucial technology for precision energy delivery. This paper mainly focuses on one of its typical applications: PRecision Electronic Warfare (PREW), and a new regional energy focusing method under ultra-sparse array is presented. By modeling regional energy focusing under ultra-sparse array as a Semi-Definite Program (SDP), an optimization can be made for self-correlation matrix of the transmitted waveforms to provide a focal spot matched with the entire target region, meanwhile, to minimize the energy level on the surrounding interesting region. Finally, four assessment indicators are proposed to evaluate energy focusing effect. The numerical results indicate that the proposed method, with more practicability, can provide a better energy focusing performance than the existed methods under typical arrays.%区域能量聚焦技术是能量精确投送中的关键技术。该文以精确电子战为典型应用背景，提出一种在超稀疏阵列下实现区域能量聚焦的方法。首先对超稀疏阵列下的区域能量聚焦问题建模并转化成半定规划(SDP)问题；然后通过优化求解发射信号的自相关矩阵使整个聚焦区域内的能量最大化，同时最小化聚焦区域以外的能量；最后提出4个评估指标以评估能量聚焦效果。仿真实验表明，该方法在典型布阵下的能量聚焦效果优于现有方法，具有较强的实用性和可行性。
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