In　order　to　demonstrate　the　effectiveness　of　the　warning　system,　this　study　explored　the　influence　of　the　head　up　display　warning　system　on　driving　behavior　under　different　weather　conditions　in　the　connected　environment　for　pedestrian　crossing　events.　Firstly,　this　paper　designed　three　warning　systems:　baseline,　head　down　display　(HDD),　and　head　up　display　(HUD).　Based　on　the　driving　simulation　platform,　it　developed　connected　scenarios　of　urban　roads　under　clear　and　foggy　weather　conditions　and　extracted　driving　behavior　parameters　through　experimental　testing.　Then,　from　the　micro　level,　the　paper　described　the　whole　spatial　change　process　of　driving　behavior　under　the　action　of　connected　HUD　warning　system　for　pedestrian　crossing　events,　analyzed　the　influence　rules　of　the　warning　systems　and　weather　conditions　on　driving　behavior,　and　constructed　the　influence　model　of　driving　behavior　including　risk　avoidance　stage　and　recovery　stage.　Next,　a　comprehensive　index　system　was　proposed　to　reflect　the　safety　level　at　the　risk　avoidance　stage,　the　recovery　level　at　the　recovery　stage　and　the　stability　level　of　the　whole　process,　including　the　first　braking　distance,　the　minimum　conflict　distance,　the　recovery　stabilization　time,　the　recovery　amount　of　velocity,　the　maximum　deceleration　and　the　maximum　acceleration.　Finally,　it　quantified　the　effects　of　different　warning　systems　(Baseline/　HDD/　HUD),　weather　conditions　(clear　weather/　foggy　weather)　and　the　interaction　between　the　two　factors　on　driving　behavior.　Research　shows　that　the　connected　HUD　warning　system　for　pedestrian　crossing　events　has　a　significant　effect　on　drivers’driving　behavior　in　the　risk　avoidance　and　recovery　stage,　and　it　significantly　improves　the　safety　level　of　driving　behavior　in　the　risk　avoidance　stage.　At　the　same　time,　it　has　a　significant　improvement　effect　on　the　recovery　efficiency　during　the　recovery　stage,　and　also　significantly　affects　the　stability　level　of　the　operational　characteristics　throughout　the　whole　process.　The　connected　HUD　warning　system　for　pedestrian　crossing　events　shows　more　obvious　advantages　under　foggy　conditions.　©　2024　South　China　University　of　Technology.　All　rights　reserved.