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建立在传输线理论上的传输线模型（TLM）法,比起传统的数值分析方法具有物理概念清晰、便于编程且程序的通用性强、计算结果稳定收敛等优点。从传输线理论出发,介绍了利用该法建立特高压电力输电线的传输线模型,并对晋东南—南阳—荆门1 000 kV特高压输电线线路性能进行分析计算,计算结果表明：当特高压输电线路输送自然功率时最为经济合理;特高压输电线路具有长距离的输电能力;但无论是超高压还是特高压输电,其输电能力随输电距离的增加而减少。该结果与实际运行情况一致,表明该方法的正确性。“,”Compared with traditional numerical analysis method,the transmission line modeling（TLM） exhibits the advantages： clear physical conception,simple and versatile programming and stable calculation results,etc.Based on the transmission line theory,TLM is established for UHT transmission line,and analytical calculation has been made for the operation performance of Southeast Shanxi-Nanyang-Jingmen 1 000 kV UHV AC transmission line.The calculation results show： it is the most economical and reasonable when UHV transmission line conveys natural power;UHV transmission line has long-distance transmission capability;the transmission capability declines with the increase of transmission distance for both EHV and UHV transmission.In accordance with the actual operation,the results prove the correctness of the method.