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On 29 August 2014, the trigger and evolution of a cusp-shaped jet werecaptured in detail at 1330 {\AA} by the Interface Region ImagingSpectrograph.At first, two neighboring mini-prominences arose in turn from lowsolar atmosphere and collided with a loop-like system over them. The collisionsbetween the loop-like system and the mini-prominences lead to the blowout andthen a cusp-shaped jet formed with a spire and an arch-base.  In the spire, many brightening blobs originating from the junction betweenthe spire and the arch-base, moved upward in a rotating manner and then in astraight line in the late phase of the jet. In the arch-base, dark and brightmaterial simultaneously tracked in a fan-like structure and the majority of thematerial moved along the fan's threads.  At the later phase of the jet's evolution, bidirectional flows emptied thearch-base, while down-flows emptied the spire, thus making the jet entirelyvanish. The extremely detailed observations in this study shed new light on howmagnetic reconnection alters the inner topological structure of a jet, andprovide a beneficial complement for understanding current jet models.

Cusp-shaped structure of a jet observed by IRIS and SDO