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In the framework of multi-channel quantum defect theory, eigenquantum defectsμa and the transformation matrices Uia of La+ are calculated from first principles by relativistic multi-channel theory, while the dipole matrix elements Da are obtained by fitting with experimental data. Then the ionic autoionization spectra of lanthanum via the intermediate state [Xe]5d6d 1P1 in the energy region of 90213-91905 cm-1 are obtained. Experimental peaks are classified and assigned by comparing with the corresponding calculated spectra. More specifically, four ionic autoionization Rydberg series converging to La2+ 5d5/2 2D5/2 and several states converging to higher lying states of La2+ are found and assigned.