The Wanhe ophiolitic mélange is redefined along the Wanhe-Mengku-Dananmei line. It is located on the eastern side of the Tongchangjie ophiolitic mélange of Paleotethys in southwestern Yunnan Province. The rocks are composed of phengite-bearing quartz schist, green-schist and amphibolite schist, tonalite and plagioclasite, laminated amphibolite and gabbros, and retrograded eclogitem, respectively equivalent to pelagic sediments, sea-floor basalt, leucocrate, mafic cumulate rock and HP-UHP pyrolite in the ophiolite suite. The LA-ICP-MS U-Pb zircon age of 470.8±5.3 Ma indicates that the Wanhe ophiolitic mélange was formed in Early Paleozoic. Based on cumulate plagioclasite in Mannahe section at northern Mengku Town in Shuangjiang County, the authors described the characteristics of major elements, REE and trace elements from igneous rocks in the Wanhe ophiolitic mélange. All igneous rocks could be divided into two types: ① leucorate, with the data SiO₂=57.00%~69.68%, Na₂O=1.36%~6.38%, K₂O=0.26%~2.45%, and average Na₂O/K₂O=10.12, thus belonging to typical sodium granite with rich LREE and "L" distribution patterns. ② basic rocks, with the data SiO₂=48.72%~53.72%, TiO₂=0.75%~1.96%, K₂O=0.45%~1.29%, and depleted-slightly enriched LREE distribution patterns, similar to features of MORB or E-MORB; in the diagrams of Th-Hf-Nb and Nb-Zr-Y, the samples fall into MORB-CBA/arc-volcanic basalt. On the whole, the samples from Mangnahe section at northern Mengku Town in Shuangjiang County correspond to MORB or E-MORB and, what is more, there exist some arc-volcanic characteristics, which are similar to features of FAB (forearc basalt), or MORB-like basalt. H-Mg and Nb-rich basalt indicates that Proto-Tethys Ocean experienced its peak of development in late Early Ordovician, followed subsequently by ocean crust's subduction in Changning-Menglian tectonic belt. Afterwards, Paleotethys Ocean accomplished inheritance evolution from Proto-Tethys Ocean through the rapid spreading of Mid Ocean Ridge along Tongchangjie to Niujingshan area.