With　the　development　and　progress　of　automobile　industry,　the　automobile　electronic　control　system　has　put　forward　higher　and　higher　requirements　to　the　controller.　From　the　realization　of　the　controller　to　vehicle　test,　all　need　hardware　in　loop　test,　and　ensure　the　real　test　results　of　core　is　to　run　in　real-time　processor　on　the　real-time　operating　system,　at　the　same　time　with　a　single　core　processor　in　the　operation　of　the　real-time　system　bottlenecks,　this　paper　USES　the　multi-core　processor　platform　to　build　real-time　problems　of　real-time　system　research.　The　Linux　system　is　studied　in　this　paper　after　the　defects　in　real　time,　this　paper　proposes　a　by　adding　preemption　patch　solution　to　realize　real-　time　Linux　system,　at　the　same　time,　using　the　advantages　of　multi-core　processors,　the　CPU　resources　of　real-time　and　non-　real-time　tasks　are　divided,　and　the　number　of　interrupts　on　the　CPU　where　the　real-time　task　is　located　is　reduced.　Finally,　a　specific　RTOS　development　case　based　on　the　PREEMPT_RT　patch　is　given,　and　on　this　basis,　the　effectiveness　of　the　proposed　scheme　in　the　real-time　performance　of　the　system　is　verified.　©　2021　IEEE.