A parallel multichannel format conversion scheme for elastic optical networking based on four wave mixing (FWM) in symmetric highly nonlinear fiber loop (S-HNLF-L) is proposed and the performance is evaluated and discussed. Parallel four channels format conversion from quadrature phase shift keying (QPSK) to binary phase shift keying (BPSK) signals at 40 Gb/s is theoretically analyzed and simulated. The results are helpful for the format-adaptive elastic optical networks.