Coronal mass ejections (CMEs) belong to the most energetic explosions in the solar atmosphere, and their occurrence rates exhibit obvious solar cycle dependence with more events taking place around solar maximum. Composition of interplanetary CMEs (ICMEs), referring to the charge states and elemental abundances of ions, opens an important avenue to investigate CMEs. In this paper, we conduct a statistical study on the charge states of five elements (Mg, Fe, Si, C, and O) and the relative abundances of six elements (Mg/O, Fe/O, Si/O, C/O, Ne/O, and He/O) within ICMEs from 1998 to 2011, and find that all the ICME compositions possess a solar cycle dependence. All of the ionic charge states and most of the relative elemental abundances are positively correlated with sunspot numbers (SSNs), and only the C/O ratios are inversely correlated with the SSNs. The compositions (except the C/O) increase with the SSNs during the ascending phase (1998–2000 and 2009–2011) and remain elevated during solar maximum and descending phase (2000–2005) compared to solar minimum (2007–2009). The charge states of low-FIP (first ionization potential) elements (Mg, Fe, and Si) and their relative abundances are correlated well, while no clear correlation is observed between the C⁶⁺/C⁵⁺ or C⁶⁺/C⁴⁺ and C/O. Most interestingly, we find that the Ne/O ratios of ICMEs and slow solar wind have the opposite solar cycle dependence.

日冕物质抛射（CMEs）属于太阳大气中能量最高的爆炸，其发生率表现出明显的太阳周期依赖性，在太阳极大值附近发生的事件较多。行星际 CMEs (ICMEs) 的组成，指的是离子的电荷态和元素丰度，为研究 CMEs 开辟了一条重要途径。在本文中，我们对五种元素（Mg、Fe、Si、C 和 O）的电荷态和六种元素（Mg/O、Fe/O、Si/O、C/ O、Ne/O 和 He/O) 在 1998 年至 2011 年间的 ICME 中，并发现所有 ICME 成分都具有太阳周期依赖性。所有离子电荷态和大多数相对元素丰度都与太阳黑子数 (SSN) 呈正相关，并且只有 C/O 比率与 SSN 呈负相关。与太阳活动极小期（2007-2009）相比，在上升阶段（1998-2000 和 2009-2011），成分（除了 C/O）随着 SSN 的增加而增加，并且在太阳活动极大期和下降阶段（2000-2005）保持升高。低 FIP（第一电离势）元素（Mg、Fe 和 Si）的电荷态及其相对丰度相关性很好，而 C 之间没有观察到明显的相关性⁶⁺ /C ⁵⁺或 C ⁶⁺ /C ⁴⁺和 C/O。最有趣的是，我们发现 ICME 和慢太阳风的 Ne/O 比具有相反的太阳周期依赖性。