The Sumdo high pressure metamorphic belt in the central and eastern part of Lhasa block is an important place for revealing the formation and evolution of Lhasa block. The Sumdo metamorphic belt records processes for the subduction and closure of the Paleo- Tethys Ocean. Numerous studies on eclogites and the country rocks have been carried out in the Sumdo metamorphic belt, but the peak P—T conditions are not well constrained and the metamorphic evolution is still controversial. In this contribution, we summarize the petrological characteristics of eclogites in different areas in Sumdo and the peak P—T conditions on the (U)HPM using different methods. The broad peak P—T conditions of the Sumdo high pressure metamorphic belt in the range of 465~880℃ and 2.5~3. 9 GPa can be explained by different calculation methods and exhumation mechanisms. Our study shows that the phase equilibrium calculation is more suitable to constrain the metamorphic process of the low- temperature eclogites compared with conventional geothermobarometry.