Dynamic　behaviors　of　droplets　transporting　through　the　cross　junction　are　experimentally　and　theoretically　studied.　The　influences　of　initial　droplet　length,　total　flux,　and　flow　rate　combination　of　different　inlets　are　systematically　analyzed.　Under　the　influence　of　the　opposite　flow,　more　types　of　flow　patterns　and　different　thresholds　of　two　behaviors　(breakup　and　obstruction)　are　obtained　after　a　comparison　with　other　references.　Deformation　characteristics　in　different　patterns　and　stages　are　discussed　in　detail　regarding　the　time-dependent　lengths　and　their　evolution　rates.　An　empirical　relation　is　proposed　to　estimate　the　time　difference　representing　the　unsynchronized　necking,　and　the　estimations　agree　well　with　the　experimental　results　in　all　cases.　Theoretical　analysis　of　the　rapid　pinch-off　during　the　breakup　process　proves　the　important　role　of　the　curvature　component　in　the　top　view,　which　leads　to　the　delayed　onset　of　the　pinch-off　in　the　cross　junction.　Furthermore,　the　influence　of　the　opposite　flow　is　shown　in　flow　pattern　maps　built　in　terms　of　the　flow　rate　ratio　and　the　normalized　droplet　length.　To　explain　the　adjustable　functions　of　the　cross　junction　at　different　flow　rate　ratios,　two　different　mechanisms　are　proposed.