膝区宇宙线成份和能谱的精确测量，对破解宇宙线起源具有重要作用。目前多家膝区实验结果差异高达30%，远不能对膝区成因做出有效评判。新一代高海拔宇宙线观测站(LHAASO)拥有高海拔、全天候和大规模优势, 利用多种探测手段对宇宙线开展联合观测，一个主要物理目标就是宇宙线成份和能谱精确测量。新探测技术 - EAS热中子探测技术可以加强阵列的宇宙线成份区分能力，进而提高宇宙线分成份能谱测量精度。在本项目支持下，我们将分析LHAASO与中俄合作EAS热中子探测阵列(ENDA)共同运行得到的符合事例，检验ENDA阵列性能，探索LHAASO和ENDA多参数混合探测宇宙线分成份能谱的最优方法，为提高LHAASO的宇宙线成份和能谱的精确度打下坚实的实验和理论基础。

By accurate measurement of components and energy spectrum in the knee region, problem of origin of cosmic ray can be solved. Up to present, results of the spectrum in the knee region obtained by several experiments have difference up to 30%, so they cannot give effective judgment to the theoretical models on origin of the knee. The Large High Altitude Air Shower Observatory (LHAASO) is a unique and new generation experiment with the advantages with high altitude, large effective area and multiple detection technologies. One of the main physical targets of LHAASO is accurate measurement of components and energy spectrum. A new technology, EAS Thermal neutron detection can reinforce array capability of cosmic ray composition separation and then improve measurement accuracy of cosmic ray component and energy spectrum. Under support of this program, we will analyze coincident events between LHAASO andChina-Russia cooperation EAS thermal neutron detector array (ENDA) to test ENDA specification, search for optimized hybrid detection method of cosmic ray component separation and energy determination. It will build foundation in experiment and theory for improving measurement accuracy of cosmic ray component and energy spectrum of LHAASO.