diff --git a/include/libpmr/synchronized_pool_resource.h b/include/libpmr/synchronized_pool_resource.h
deleted file mode 100644
index 578d494..0000000
--- a/include/libpmr/synchronized_pool_resource.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/**
- * \file libpmr/synchronized_pool_resource.h
- * \author mutouyun (orz@orzz.org)
- * \brief A thread-safe std::pmr::memory_resource for managing allocations in pools of different block sizes.
- * \date 2023-12-23
- */
-#pragma once
-
-#include <cstddef>  // std::size_t, std::max_align_t
-
-#include "libimp/export.h"
-#include "libpmr/def.h"
-
-LIBPMR_NAMESPACE_BEG_
-
-/**
- * \class LIBIMP_EXPORT synchronized_pool_resource
- * \brief `synchronized_pool_resource` may be accessed from multiple threads without external synchronization, 
- *        and have thread-specific pools to reduce synchronization costs.
- * \note Unlike the standard library implementation, `synchronized_pool_resource` automatically manages 
- *       the block size and reclaims all deallocated memory to the central heap when the thread is destroyed, 
- *       rather than being destructed on its own.
- * \see https://en.cppreference.com/w/cpp/memory/synchronized_pool_resource
- */
-class LIBIMP_EXPORT synchronized_pool_resource {
-public:
-  /// \brief Returns a pointer to a `synchronized_pool_resource`.
-  static synchronized_pool_resource *get() noexcept;
-
-  /// \brief Allocates storage with a size of at least bytes bytes, aligned to the specified alignment.
-  /// \remark Returns nullptr if storage of the requested size and alignment cannot be obtained.
-  /// \see https://en.cppreference.com/w/cpp/memory/memory_resource/do_allocate
-  void *allocate(std::size_t bytes, std::size_t alignment = alignof(std::max_align_t)) noexcept;
-
-  /// \brief Deallocates the storage pointed to by p.
-  /// \see https://en.cppreference.com/w/cpp/memory/memory_resource/deallocate
-  void deallocate(void *p, std::size_t bytes, std::size_t alignment = alignof(std::max_align_t)) noexcept;
-};
-
-LIBPMR_NAMESPACE_END_
diff --git a/src/libpmr/synchronized_pool_resource.cpp b/src/libpmr/synchronized_pool_resource.cpp
deleted file mode 100644
index f14c996..0000000
--- a/src/libpmr/synchronized_pool_resource.cpp
+++ /dev/null
@@ -1,39 +0,0 @@
-
-#include "libimp/log.h"
-
-#include "libpmr/synchronized_pool_resource.h"
-#include "libpmr/block_pool.h"
-
-#include "verify_args.h"
-
-LIBPMR_NAMESPACE_BEG_
-namespace {
-
-} // namespace
-
-synchronized_pool_resource *synchronized_pool_resource::get() noexcept {
-  static synchronized_pool_resource mem_res;
-  return &mem_res;
-}
-
-void *synchronized_pool_resource::allocate(std::size_t bytes, std::size_t alignment) noexcept {
-  LIBIMP_LOG_();
-  if (!verify_args(bytes, alignment) || (alignment > alignof(std::max_align_t))) {
-    log.error("invalid bytes = ", bytes, ", alignment = ", alignment);
-    return nullptr;
-  }
-  return nullptr;
-}
-
-void synchronized_pool_resource::deallocate(void *p, std::size_t bytes, std::size_t alignment) noexcept {
-  LIBIMP_LOG_();
-  if (p == nullptr) {
-    return;
-  }
-  if (!verify_args(bytes, alignment) || (alignment > alignof(std::max_align_t))) {
-    log.error("invalid bytes = ", bytes, ", alignment = ", alignment);
-    return;
-  }
-}
-
-LIBPMR_NAMESPACE_END_