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High spin states in 137 Ce have been studied by using the heavy-ion induced reaction 124Sn(18 O, 5n) carried out at China Institute of Atomic Energy. Partial level scheme with spin up to (43/2-), including a high spin collective rotational band observed for the first time, has been established. The collective band shows the properties similar to those oblate bands with γ ～-60° in neighboring nuclei and probably originates from the five quasi-particle configuration νs1/2 [vh11/2]2 π97/2 πh11/2. The characteristics of this oblate band have been discussed.