diff --git a/resourceschedule/ffrt/BUILD.gn b/resourceschedule/ffrt/BUILD.gn
index f9ad3084ea728edb153ca2498c4319845cf7fbfe..0e48ac34e8c364d7830b42ff57c733b5a1402973 100644
--- a/resourceschedule/ffrt/BUILD.gn
+++ b/resourceschedule/ffrt/BUILD.gn
@@ -9,7 +9,7 @@
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
-# limitations under the License.
+# limitations under the License.
 
 import("//build/ohos.gni")
 import("//build/ohos/ndk/ndk.gni")
@@ -18,6 +18,7 @@ ohos_ndk_headers("ffrt_header") {
   dest_dir = "$ndk_headers_out_dir/ffrt"
   sources = [
     "c/condition_variable.h",
+    "c/fiber.h",
     "c/loop.h",
     "c/mutex.h",
     "c/queue.h",
@@ -35,6 +36,7 @@ ohos_ndk_library("libffrt_ndk") {
   system_capability = "SystemCapability.Resourceschedule.Ffrt.Core"
   system_capability_headers = [
     "ffrt/condition_variable.h",
+    "ffrt/fiber.h",
     "ffrt/loop.h",
     "ffrt/mutex.h",
     "ffrt/queue.h",
diff --git a/resourceschedule/ffrt/c/fiber.h b/resourceschedule/ffrt/c/fiber.h
new file mode 100644
index 0000000000000000000000000000000000000000..c5096c38ad1463d707134d88cca289cca5a7eef4
--- /dev/null
+++ b/resourceschedule/ffrt/c/fiber.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @addtogroup FFRT
+ * @{
+ *
+ * @brief Provides FFRT C APIs.
+ *
+ * @since 20
+ */
+
+/**
+ * @file fiber.h
+ *
+ * @brief Declares the fiber interfaces in C.
+ *
+ * @library libffrt.z.so
+ * @kit FunctionFlowRuntimeKit
+ * @syscap SystemCapability.Resourceschedule.Ffrt.Core
+ * @since 20
+ */
+
+#ifndef FFRT_API_C_FIBER_H
+#define FFRT_API_C_FIBER_H
+
+#include "type_def.h"
+
+/**
+ * @brief Initializes a fiber.
+ *
+ * This function initializes a fiber structure, preparing it for execution.
+ *
+ * @param fiber Indicates the pointer to the fiber structure to be initialized.
+ * @param func Indicates the entry point function that the fiber will execute.
+ * @param arg Indicates the argument to be passed to the entry point function.
+ * @param stack Indicates the pointer to the memory region to be used as the fiber's stack.
+ * @param stack_size Indicates the size of the stack in bytes.
+ * @return Returns <b>ffrt_success</b> if the fiber is initialized;
+           returns <b>ffrt_error</b> otherwise.
+ * @since 20
+ */
+FFRT_C_API int ffrt_fiber_init(ffrt_fiber_t* fiber, void(*func)(void*), void* arg, void* stack, size_t stack_size);
+
+
+/**
+ * @brief Switch execution context between two fibers.
+ *
+ * Switches the execution context by saving the current context into the fiber specified
+ * by @c from and restoring the context from the fiber specified by @c to.
+ *
+ * @param from Indicates the pointer to the fiber into which the current context will be saved.
+ * @param to Indicates the pointer to the fiber from which the context will be restored.
+ * @since 20
+ */
+FFRT_C_API void ffrt_fiber_switch(ffrt_fiber_t* from, ffrt_fiber_t* to);
+
+#endif // FFRT_API_C_FIBER_H
+/** @} */
\ No newline at end of file
diff --git a/resourceschedule/ffrt/c/type_def.h b/resourceschedule/ffrt/c/type_def.h
index 7fc8c6ed9ffbcd36287417236ddc23ba43a4cf84..b91ceeb5162b823d3de363081a248103411daf74 100644
--- a/resourceschedule/ffrt/c/type_def.h
+++ b/resourceschedule/ffrt/c/type_def.h
@@ -128,6 +128,25 @@ typedef enum {
      * @since 18
      */
     ffrt_rwlock_storage_size = 64,
+    /** Fiber storage size.
+     *
+     * This constant defines the fiber storage size.
+     * The actual value depends on the target architecture:
+     * - __aarch64__: 22
+     * - __arm__: 64
+     * - __x86_64__: 8
+     *
+     * @since 20
+     */
+#if defined(__aarch64__)
+    ffrt_fiber_storage_size = 22,
+#elif defined(__arm__)
+    ffrt_fiber_storage_size = 64,
+#elif defined(__x86_64__)
+    ffrt_fiber_storage_size = 8,
+#else
+#error "unsupported architecture"
+#endif
 } ffrt_storage_size_t;
 
 /**
@@ -302,6 +321,16 @@ typedef struct {
     uint32_t storage[(ffrt_cond_storage_size + sizeof(uint32_t) - 1) / sizeof(uint32_t)];
 } ffrt_cond_t;
 
+/**
+ * @brief Defines the fiber structure.
+ *
+ * @since 20
+ */
+typedef struct {
+    /** An array of uint32_t used to store the fiber. */
+    uintptr_t storage[ffrt_fiber_storage_size];
+} ffrt_fiber_t;
+
 /**
  * @brief Defines the poller callback function type.
  *
diff --git a/resourceschedule/ffrt/ffrt.ndk.json b/resourceschedule/ffrt/ffrt.ndk.json
index 84474b74e9e78a4696851d5e8fb3a719875d21b7..3ab20c1207d048ce613800956e2b5aaeba381411 100644
--- a/resourceschedule/ffrt/ffrt.ndk.json
+++ b/resourceschedule/ffrt/ffrt.ndk.json
@@ -115,6 +115,14 @@
         "first_introduced": "12",
         "name": "ffrt_task_handle_dec_ref"
     },
+    {
+        "first_introduced": "20",
+        "name": "ffrt_fiber_init"
+    },
+    {
+        "first_introduced": "20",
+        "name": "ffrt_fiber_switch"
+    },
     { "name": "ffrt_task_handle_destroy" },
     { "name": "ffrt_wait_deps" },
     { "name": "ffrt_wait" },