There are two sets of basalts in Bayingou ophiolitic mélange. One is low in TiO₂ (only 0.81% to 1.00%), and its REE content shows a slight depletion of LREE in comparison with HREE. Chondrite-normalized REE patterns and primordial mantle normalized trace elements patterns show flat distribution. Nb and Ta have a slight depletion. The basalt is therefore one of the mid-ocean ridge basalts. It is tentatively considered that the basalt was formed at the early stage of ocean formation and the source area was the mid-ocean ridge basalt which had not experienced large-scale extraction phase of magma. Another kind of basalt of this area has the characteristics of a typical oceanic island basalt. The rock has high TiO₂ content(1.89%～3.14%)and rich alkalis, LILE, LREE and HFSE, and the primitive mantle normalized trace element patterns show clear positive anomalies of Nb and Ta. Trace elements have the features of EMII type OIB.