In this paper,the high-order cyclic cumulants are firstly a pplied to the modulation formats identification in Orthogonal frequency division multiplexing (OFDM)-based elast ic optical networking (EON) under the condition of lack of prior information.By calculating the high-order cyclic cumulants of different modulation formats (BP SK,QPSK,16QAM and 64QAM) for OFDM-based EON signals,we propose the identification threshold interval of OFDM -based EON signals with different modulation formats,and verify the identification accuracy by simulation.When t he sub-carriers are modulated randomly by different modulation formats,the identification accuracy for OFDM- based EON signal reaches 100% by using the proposed identification threshold interval with OSNR of 34dB and baud-rate of 28G.