The Kuhai Group is the oldest metamorphosed basement in southern East Kunlun Terrane (SEKT) which is exposed around Kuhai-Wenquan area. This study presents in situ zircon U-Pb analyses (LA-ICP-MS) of 67 zircons from two paragneisses in the Kuhai Group in SEKT. The results suggest that the Kuhai Group was deposited in Early Neoproterozoic and underwent a metamorphic event in Silurian (423 Ma). Compared with the zircon U-Pb dating of the Jinshuikou Group in northern East Kunlun Terrane (NEKT), the ages of their source materials all have the records of 1550~1650 Ma, 1900~2100 Ma and 2350~2?550 Ma, suggesting that they might have had similar sources; peak ages of the youngest member in the age spectrum with magmatic origin are 750~800 Ma and 900~1250 Ma respectively, suggesting that their earliest sedimentary ages are Early Neoproterozoic and Late Mesoproterozoic-Early Neoproterozoic respectively; peak ages of the youngest member in the age spectrum with metamorphism origin are 400~450 Ma, indicating that they all underwent the amphibolite facie metamorphism in Silurian. It can therefore be inferred that the oldest metamorphosed basements in SEKT and NEKT had the similar evolution histories during pre-Silurian, and even if the paleo-ocean basin between the SEKT and the NEKT existed in early Paleozoic, the ocean basin must have been a small one.