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The distant luminous quasars provide unique probes to the formation of the earliest supermassive black holes (SMBHs), the assembly of massive galaxies and the reionization of intergalactic medium. In this talk, I will review the ongoing reionization-era quasar survey which yields a sizable sample of quasars at redshift z~7 and the new redshift record holder quasar at z=7.6, deep into the epoch of reionization. The existence of billion-solar-mass black holes at redshift beyond 7.5 posts stringent constraints on the theory of black hole formation and growth in the early Universe. This unique quasar sample allows us to measure the quasar luminosity function and to characterize the quasar evolution in the reionization-era. In addition, I will present the on-going projects for investigating quasar host galaxies using high resolution ALMA observations and studying the large-scale environment of the earliest SMBHs with deep wide field imaging.