Photodissociation dynamics of the N2O+ cation in its B2Π state has been experimentally studied in an energy region around the NO+(1Σ+) + N(2P) dissociation limit using a cryogenic cylindrical ion trap velocity map imaging spectrometer. The results show that the NO+(1Σ+) + N(2D) product channel dominates the dissociation dynamics and requires the NNO angle to change by 30°-50° prior to dissociation. The NO+(1Σ+) + N(2P) product channel, which directly correlates with the B2Π state but less competitive, opens immediately when the photon energy reaches the dissociation limits, indicating a flat dissociation pathway without bending on the B2Π state surface.