This study investigated the effects of operating conditions and nozzle geometry, including injection pump speed, valve opening pressure, injected mass, nozzle hole diameter and length-to-diameter ratio L/D as well as nozzle sac volume, etc., on the spray tip penetration measured by a light sheet interception method. It is clarified that spray tip penetration mainly depends on initial injection pressure before the jet breaks up, and on the injection rate after its breakup, respectively. The nozzle geometry and ambient pressure also impact the spray tip penetration to a great extent.