  Large volume liquid scintillator detectors with ultra-low background levels
have been wildly used to study neutrino physics and search for dark matter.
Event vertex and event start time is not only useful for event selection, but
also essential for reconstruction of event energy. In this paper, a set of
event vertex and event time reconstruction algorithms using charge and time
information collected by photomultiplier tubes are comprehensively studied. The
impact of photomultiplier tubes properties is also investigated. The results
show that transit time spread is the main effect that worsens the vertex
reconstruction, while the influence of dark noise is limited. In addition, when
the event is close to the detector boundary, charge information provides better
performance for vertex reconstruction than time information.
