The Tengchong block is an important part of the southeastern Tibetan Plateau, corresponding to the Lhasa block. The discovery of the Songduo eclogite belt in recent years proves the existence of the subduction and collision event in Lhasa block, and the problem has cropped up whether the same event existed or not in Tengchong block. The emplacement age and tectonic setting of the diorite in Tengchong block is identical with the data of eclogite in the Lhasa block, and regional angular unconformity with the lack of P2 to T1, suggests that the subduction-collision in Tengchong block did happen during early Indosinian, like the event that happened between Lhasa and northern Australia blocks from P2 to T1.