Vertical　cavity　surface　emitting　laser　(VCSEL)　array　is　the　important　laser　source　in　LiDAR　ranging　systems　(LiDAR).　The　VCSEL　array　have　important　effects　on　the　electro-optical　transient　response　characteristics　and　power　density　for　time-of-flight　ToF　ranging　technology.　In　this　study,　by　using　the　carrier-photon　coupling　equation　of　semiconductor　lasers,　we　established　a　Simulink　model　of　the　rate　equation　of　pulsed　VCSEL　arrays,　an　equivalent　circuit　model　and　a　heat　dissipation　model　of　VCSELs.　We　analyzed　the　factors　affecting　the　electro-optical　transient　response　of　pulsed　VCSEL　arrays　theoretically.　Then　we　verified　the　result　experimentally.　In　this　paper,　the　effects　of　array　size　and　spurious　parameters　on　the　electro-optical　delay　time　and　optical　pulse　rise　time　of　VCSEL　arrays　are　discussed.　Both　simulation　and　experimental　results　show　that　the　rise　time　of　the　VCSEL　array　decreases　and　then　increases　as　the　size　of　the　array　increases　in　the　narrow　pulse　driving　circuit.　This　provides　a　light　source　optimization　scheme　for　the　application　of　VCSEL　arrays　in　LiDAR　ranging　systems　(LiDAR).　It　also　provides　a　theoretical　basis　for　the　in-depth　study　of　VCSEL　arrays　under　pulse　driving.　©　2023　SPIE.