  A brief overview on the current status of the census of the early universe
population is given. Observational surveys of high redshift galaxies provide
direct opportunities to witness the cosmic dawn and to have better
understanding of how and when infant galaxies evolve into mature ones. It is a
much more astronomical approach in contrast to the physical approach of to
study the spatial fluctuation of cosmic microwave radiation. Recent findings in
these two areas greatly advanced our understanding of the early Universe. I
will describe the basic properties of several target objects we are looking for
and the concrete methods astronomers are using to discover those objects in
early Universe. My talk starts with Lyman alpha emitters and Lyman break
galaxies, then introduces a clever approach to use gravitational lensing effect
of clusters of galaxies to detect distant faint galaxies behind the clusters.
Finally I will touch on the status and prospects of surveys for quasars and
gamma-ray bursts.
