diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index de183c8..7ad7c5b 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -482,6 +482,18 @@ set_target_properties(action_recog PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${RK_PLUGIN_OUTPUT_DIR}
 )
 
+# event_fusion plugin (behavior event id and lifecycle normalization)
+add_library(event_fusion SHARED
+    event_fusion/event_fusion_node.cpp
+)
+target_include_directories(event_fusion PRIVATE ${CMAKE_SOURCE_DIR}/include ${CMAKE_SOURCE_DIR}/third_party)
+target_link_libraries(event_fusion PRIVATE project_options Threads::Threads)
+set_target_properties(event_fusion PROPERTIES
+    OUTPUT_NAME "event_fusion"
+    LIBRARY_OUTPUT_DIRECTORY ${RK_PLUGIN_OUTPUT_DIR}
+    RUNTIME_OUTPUT_DIRECTORY ${RK_PLUGIN_OUTPUT_DIR}
+)
+
 # storage plugin (continuous recording with segment management)
 add_library(storage SHARED
     storage/storage_node.cpp
@@ -553,7 +565,7 @@ set_target_properties(ai_shoe_det PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${RK_PLUGIN_OUTPUT_DIR}
 )
 
-install(TARGETS input_rtsp input_file publish preprocess ai_yolo ai_face_det ai_scrfd ai_scrfd_sliding ai_face_recog tracker gate osd alarm logic_gate region_event action_recog storage ai_scheduler ai_shoe_det
+install(TARGETS input_rtsp input_file publish preprocess ai_yolo ai_face_det ai_scrfd ai_scrfd_sliding ai_face_recog tracker gate osd alarm logic_gate region_event action_recog event_fusion storage ai_scheduler ai_shoe_det
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}/rk3588-media-server/plugins
     RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}/rk3588-media-server/plugins
 )
diff --git a/plugins/event_fusion/event_fusion_node.cpp b/plugins/event_fusion/event_fusion_node.cpp
new file mode 100644
index 0000000..d17df50
--- /dev/null
+++ b/plugins/event_fusion/event_fusion_node.cpp
@@ -0,0 +1,139 @@
+#include "event_fusion_node.h"
+
+#include <algorithm>
+#include <map>
+#include <memory>
+#include <set>
+#include <sstream>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "behavior/behavior_event.h"
+
+namespace rk3588 {
+namespace {
+
+struct ActiveEvent {
+    int event_id = -1;
+    BehaviorEventItem last_item{};
+    bool seen_in_frame = false;
+};
+
+static std::string TypeName(BehaviorEventType type) {
+    switch (type) {
+        case BehaviorEventType::Intrusion: return "intrusion";
+        case BehaviorEventType::Climb: return "climb";
+        case BehaviorEventType::Fall: return "fall";
+        case BehaviorEventType::Fight: return "fight";
+    }
+    return "unknown";
+}
+
+static std::string MakeKey(const BehaviorEventItem& item) {
+    std::vector<int> track_ids = item.track_ids;
+    std::sort(track_ids.begin(), track_ids.end());
+
+    std::ostringstream oss;
+    oss << TypeName(item.type) << "|" << item.region_id << "|" << item.source;
+    for (int track_id : track_ids) {
+        oss << "|" << track_id;
+    }
+    return oss.str();
+}
+
+}  // namespace
+
+struct EventFusionNode::Impl {
+    int next_event_id = 1;
+    std::map<std::string, ActiveEvent> active_events;
+};
+
+EventFusionNode::EventFusionNode() : impl_(std::make_unique<Impl>()) {}
+
+EventFusionNode::~EventFusionNode() = default;
+
+std::string EventFusionNode::Id() const {
+    return id_;
+}
+
+std::string EventFusionNode::Type() const {
+    return "event_fusion";
+}
+
+bool EventFusionNode::Init(const SimpleJson& config, const NodeContext& ctx) {
+    id_ = config.ValueOr<std::string>("id", "event_fusion");
+    output_queues_ = ctx.output_queues;
+    return true;
+}
+
+bool EventFusionNode::Start() {
+    return true;
+}
+
+void EventFusionNode::Stop() {}
+
+NodeStatus EventFusionNode::Process(FramePtr frame) {
+    if (!frame) return NodeStatus::DROP;
+
+    EnsureBehaviorEvents(*frame);
+    for (auto& [_, active] : impl_->active_events) {
+        active.seen_in_frame = false;
+    }
+
+    std::vector<BehaviorEventItem> normalized;
+    normalized.reserve(frame->behavior_events->items.size() + impl_->active_events.size());
+
+    for (auto item : frame->behavior_events->items) {
+        const std::string key = MakeKey(item);
+        auto& active = impl_->active_events[key];
+        if (active.event_id < 0) {
+            active.event_id = impl_->next_event_id++;
+        }
+        active.seen_in_frame = true;
+        item.event_id = active.event_id;
+        active.last_item = item;
+        normalized.push_back(std::move(item));
+    }
+
+    std::vector<std::string> to_remove;
+    for (auto& [key, active] : impl_->active_events) {
+        if (active.seen_in_frame) continue;
+
+        BehaviorEventItem ended = active.last_item;
+        ended.status = BehaviorEventStatus::Ended;
+        ended.event_id = active.event_id;
+        ended.last_pts = frame->pts;
+        if (frame->pts >= ended.start_pts) {
+            ended.duration_ms = frame->pts - ended.start_pts;
+        }
+        normalized.push_back(std::move(ended));
+        to_remove.push_back(key);
+    }
+
+    for (const auto& key : to_remove) {
+        impl_->active_events.erase(key);
+    }
+
+    frame->behavior_events->items = std::move(normalized);
+    PushToDownstream(frame);
+    return NodeStatus::OK;
+}
+
+void EventFusionNode::EnsureBehaviorEvents(Frame& frame) {
+    if (!frame.behavior_events) {
+        frame.behavior_events = std::make_shared<BehaviorEventResult>();
+    }
+}
+
+void EventFusionNode::PushToDownstream(const FramePtr& frame) {
+    for (auto& q : output_queues_) {
+        if (q) q->Push(frame);
+    }
+}
+
+#ifndef RK3588_TEST_BUILD
+REGISTER_NODE(EventFusionNode, "event_fusion");
+#endif
+
+}  // namespace rk3588
diff --git a/plugins/event_fusion/event_fusion_node.h b/plugins/event_fusion/event_fusion_node.h
new file mode 100644
index 0000000..702a097
--- /dev/null
+++ b/plugins/event_fusion/event_fusion_node.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "node.h"
+
+namespace rk3588 {
+
+class EventFusionNode final : public INode {
+public:
+    EventFusionNode();
+    ~EventFusionNode() override;
+
+    std::string Id() const override;
+    std::string Type() const override;
+    bool Init(const SimpleJson& config, const NodeContext& ctx) override;
+    bool Start() override;
+    void Stop() override;
+    NodeStatus Process(FramePtr frame) override;
+
+private:
+    void EnsureBehaviorEvents(Frame& frame);
+    void PushToDownstream(const FramePtr& frame);
+
+    struct Impl;
+    std::unique_ptr<Impl> impl_;
+    std::string id_;
+    std::vector<std::shared_ptr<SpscQueue<FramePtr>>> output_queues_;
+};
+
+}  // namespace rk3588
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b20b6da..60115ed 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -40,6 +40,7 @@ add_executable(rk3588_gtests
     test_behavior_event_model.cpp
     test_region_event.cpp
     test_action_recog.cpp
+    test_event_fusion.cpp
     test_infer_backend.cpp
     test_image_processor.cpp
     test_codec_backend.cpp
@@ -51,6 +52,7 @@ add_executable(rk3588_gtests
     ${CMAKE_SOURCE_DIR}/src/utils/dma_alloc.cpp
     ${CMAKE_SOURCE_DIR}/plugins/region_event/region_event_node.cpp
     ${CMAKE_SOURCE_DIR}/plugins/action_recog/action_recog_node.cpp
+    ${CMAKE_SOURCE_DIR}/plugins/event_fusion/event_fusion_node.cpp
 )
 
 target_include_directories(rk3588_gtests PRIVATE
diff --git a/tests/test_event_fusion.cpp b/tests/test_event_fusion.cpp
new file mode 100644
index 0000000..37f09dd
--- /dev/null
+++ b/tests/test_event_fusion.cpp
@@ -0,0 +1,111 @@
+#include <gtest/gtest.h>
+
+#include <memory>
+#include <string>
+
+#include "behavior/behavior_event.h"
+#include "frame/frame.h"
+#include "node.h"
+#include "utils/simple_json.h"
+#include "../plugins/event_fusion/event_fusion_node.h"
+
+namespace rk3588 {
+namespace {
+
+SimpleJson ParseFusionConfig(const std::string& text) {
+    SimpleJson config;
+    std::string err;
+    const bool ok = ParseSimpleJson(text, config, err);
+    EXPECT_TRUE(ok) << err;
+    return config;
+}
+
+TEST(EventFusionTest, AssignsStableEventIdAcrossFramesForSameTrackAndType) {
+    EventFusionNode node;
+
+    const std::string config_text = R"({
+        "id": "event_fusion"
+    })";
+
+    SimpleJson config = ParseFusionConfig(config_text);
+    NodeContext ctx;
+    auto out = std::make_shared<SpscQueue<FramePtr>>(4, QueueDropStrategy::DropOldest);
+    ctx.output_queues.push_back(out);
+
+    ASSERT_TRUE(node.Init(config, ctx));
+    ASSERT_TRUE(node.Start());
+
+    auto frame1 = std::make_shared<Frame>();
+    frame1->pts = 1000;
+    frame1->behavior_events = std::make_shared<BehaviorEventResult>();
+    {
+        BehaviorEventItem item;
+        item.type = BehaviorEventType::Fall;
+        item.status = BehaviorEventStatus::Active;
+        item.track_ids = {42};
+        item.source = "action_recog";
+        frame1->behavior_events->items.push_back(item);
+    }
+
+    auto frame2 = std::make_shared<Frame>();
+    frame2->pts = 1100;
+    frame2->behavior_events = std::make_shared<BehaviorEventResult>();
+    {
+        BehaviorEventItem item;
+        item.type = BehaviorEventType::Fall;
+        item.status = BehaviorEventStatus::Active;
+        item.track_ids = {42};
+        item.source = "action_recog";
+        frame2->behavior_events->items.push_back(item);
+    }
+
+    EXPECT_EQ(static_cast<int>(node.Process(frame1)), static_cast<int>(NodeStatus::OK));
+    EXPECT_EQ(static_cast<int>(node.Process(frame2)), static_cast<int>(NodeStatus::OK));
+    ASSERT_EQ(frame1->behavior_events->items.size(), 1u);
+    ASSERT_EQ(frame2->behavior_events->items.size(), 1u);
+    EXPECT_GT(frame1->behavior_events->items[0].event_id, 0);
+    EXPECT_EQ(frame1->behavior_events->items[0].event_id, frame2->behavior_events->items[0].event_id);
+}
+
+TEST(EventFusionTest, MarksEventEndedWhenSourceStopsEmittingIt) {
+    EventFusionNode node;
+
+    const std::string config_text = R"({
+        "id": "event_fusion"
+    })";
+
+    SimpleJson config = ParseFusionConfig(config_text);
+    NodeContext ctx;
+    auto out = std::make_shared<SpscQueue<FramePtr>>(4, QueueDropStrategy::DropOldest);
+    ctx.output_queues.push_back(out);
+
+    ASSERT_TRUE(node.Init(config, ctx));
+    ASSERT_TRUE(node.Start());
+
+    auto frame1 = std::make_shared<Frame>();
+    frame1->pts = 1000;
+    frame1->behavior_events = std::make_shared<BehaviorEventResult>();
+    {
+        BehaviorEventItem item;
+        item.type = BehaviorEventType::Intrusion;
+        item.status = BehaviorEventStatus::Active;
+        item.track_ids = {9};
+        item.source = "region_event";
+        item.region_id = "zone_a";
+        frame1->behavior_events->items.push_back(item);
+    }
+
+    auto frame2 = std::make_shared<Frame>();
+    frame2->pts = 1300;
+    frame2->behavior_events = std::make_shared<BehaviorEventResult>();
+
+    EXPECT_EQ(static_cast<int>(node.Process(frame1)), static_cast<int>(NodeStatus::OK));
+    EXPECT_EQ(static_cast<int>(node.Process(frame2)), static_cast<int>(NodeStatus::OK));
+    ASSERT_EQ(frame2->behavior_events->items.size(), 1u);
+    EXPECT_EQ(frame2->behavior_events->items[0].type, BehaviorEventType::Intrusion);
+    EXPECT_EQ(frame2->behavior_events->items[0].status, BehaviorEventStatus::Ended);
+    EXPECT_GT(frame2->behavior_events->items[0].event_id, 0);
+}
+
+}  // namespace
+}  // namespace rk3588