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We present an observed relationship between Eddington ratio ({\lambda}Edd)and optical narrow-emission-line ratio ([N II]{\lambda}6583/H{\alpha}) ofX-ray-selected broad-line active galactic nuclei (AGN) at 0.6 < z < 1.7. We use27 near-infrared spectra from the Fiber Multi-Object Spectrograph along with 26sources from the literature. We show that the {\lambda}Edd and [NII]{\lambda}6583/H{\alpha} ratio at 0.6 < z < 1.7 exhibits a similaranti-correlation distribution of {\lambda}Edd-[N II]{\lambda}6583/H{\alpha} ashas been found for local (<z> = 0.036), ultra-hard X-ray selected AGN. Theobserved distribution implies that there is a consistent relationship fromlocal to z \sim 1.7 which corresponds from the present time to 4 Gyr old.Further study of high redshift low Eddington ratio AGN (log{\lambda}Edd < -2)is necessary to determine fully whether the {\lambda}Edd-[NII]{\lambda}6583/H{\alpha} anti-correlation still holds in high-redshift AGN atlow Eddington ratios.

An observational link between AGN Eddington ratio and [NII]{\lambda}6583/Ha at 0.6