diff --git a/contrib/kvproto b/contrib/kvproto
index 74c8557cdac..6a238795ae0 160000
--- a/contrib/kvproto
+++ b/contrib/kvproto
@@ -1 +1 @@
-Subproject commit 74c8557cdac0e1e3e87bcee4ba23cfb4f8fcd930
+Subproject commit 6a238795ae082905d3262fe642063bdcdbb1e973
diff --git a/dbms/src/Flash/FlashService.cpp b/dbms/src/Flash/FlashService.cpp
index 9b07a8c1709..43348a76cb8 100644
--- a/dbms/src/Flash/FlashService.cpp
+++ b/dbms/src/Flash/FlashService.cpp
@@ -38,6 +38,7 @@
 #include <IO/IOThreadPools.h>
 #include <Interpreters/Context.h>
 #include <Interpreters/SharedContexts/Disagg.h>
+#include <Interpreters/TimezoneInfo.h>
 #include <Interpreters/executeQuery.h>
 #include <Poco/Message.h>
 #include <Server/IServer.h>
@@ -48,11 +49,14 @@
 #include <Storages/KVStore/Read/RegionException.h>
 #include <Storages/KVStore/TMTContext.h>
 #include <Storages/S3/S3Common.h>
+#include <Storages/Tantivy/TiCIReadTaskPool.h>
 #include <common/logger_useful.h>
 #include <grpcpp/server_builder.h>
 #include <grpcpp/support/status.h>
 #include <grpcpp/support/status_code_enum.h>
 #include <kvproto/disaggregated.pb.h>
+#include <tici-search-lib/src/lib.rs.h>
+#include <tipb/executor.pb.h>
 
 #include <chrono>
 #include <ext/scope_guard.h>
@@ -193,6 +197,76 @@ void updateSettingsForAutoSpill(ContextPtr & context, const LoggerPtr & log)
             LOG_WARNING(log, "auto spill is enabled, so per operator's memory threshold is disabled");
     }
 }
+
+rust::Vec<::Range> buildEstimateKeyRanges(const google::protobuf::RepeatedPtrField<coprocessor::KeyRange> & key_ranges)
+{
+    rust::Vec<::Range> ranges;
+    for (const auto & key_range : key_ranges)
+    {
+        ranges.push_back({
+            .start = rust::Slice<const std::uint8_t>(
+                reinterpret_cast<const std::uint8_t *>(key_range.start().data()),
+                key_range.start().size()),
+            .end = rust::Slice<const std::uint8_t>(
+                reinterpret_cast<const std::uint8_t *>(key_range.end().data()),
+                key_range.end().size()),
+        });
+    }
+    return ranges;
+}
+
+TimezoneInfo buildEstimateTimezoneInfo(const coprocessor::TiCIEstimateCountRequest & request)
+{
+    TimezoneInfo timezone_info;
+    if (!request.time_zone_name().empty())
+        timezone_info.resetByTimezoneName(request.time_zone_name());
+    else
+        timezone_info.resetByTimezoneOffset(request.time_zone_offset());
+    return timezone_info;
+}
+
+tipb::FTSQueryInfo parseEstimateQueryInfo(const coprocessor::TiCIEstimateCountRequest & request)
+{
+    tipb::FTSQueryInfo query_info;
+    if (!query_info.ParseFromString(request.fts_query_info()))
+        throw TiFlashException("Failed to parse fts_query_info", Errors::Coprocessor::BadRequest);
+    if (query_info.match_expr_size() == 0)
+        throw TiFlashException("Empty TiCI estimate query expression", Errors::Coprocessor::BadRequest);
+    return query_info;
+}
+
+rust::Vec<::Shard> buildEstimateShards(const coprocessor::TiCIEstimateCountRequest & request, UInt32 keyspace_id)
+{
+    rust::Vec<::Shard> shards;
+    for (const auto & shard_info : request.shard_infos())
+    {
+        shards.push_back({
+            .keyspace_id = keyspace_id,
+            .index_id = request.index_id(),
+            .shard_id = shard_info.shard_id(),
+            .shard_epoch = shard_info.shard_epoch(),
+        });
+    }
+    return shards;
+}
+
+rust::Vec<::ShardWithRange> buildEstimateShardRanges(
+    const coprocessor::TiCIEstimateCountRequest & request,
+    const rust::Vec<bool> & local_results)
+{
+    rust::Vec<::ShardWithRange> shards;
+    for (int i = 0; i < request.shard_infos_size(); ++i)
+    {
+        const auto & shard_info = request.shard_infos(i);
+        if (i >= static_cast<int>(local_results.size()) || !local_results[static_cast<size_t>(i)])
+            continue;
+        shards.push_back({
+            .shard_id = shard_info.shard_id(),
+            .ranges = buildEstimateKeyRanges(shard_info.ranges()),
+        });
+    }
+    return shards;
+}
 } // namespace
 
 grpc::Status FlashService::Coprocessor(
@@ -884,6 +958,63 @@ grpc::Status FlashService::Compact(
     return manual_compact_manager->handleRequest(request, response);
 }
 
+grpc::Status FlashService::GetEstimateTiCICount(
+    grpc::ServerContext * grpc_context,
+    const coprocessor::TiCIEstimateCountRequest * request,
+    coprocessor::TiCIEstimateCountResponse * response)
+{
+    CPUAffinityManager::getInstance().bindSelfGrpcThread();
+    auto check_result = checkGrpcContext(grpc_context);
+    if (!check_result.ok())
+        return check_result;
+
+    try
+    {
+        if (request->shard_infos_size() == 0)
+            return grpc::Status::OK;
+
+        const auto keyspace_id = RequestUtils::deriveKeyspaceID(request->context());
+        const auto fts_query_info = parseEstimateQueryInfo(*request);
+        const auto timezone_info = buildEstimateTimezoneInfo(*request);
+        auto [query, column_ids] = TS::TiCIReadTaskPool::tipbToTiCIExpr(fts_query_info.match_expr(), timezone_info);
+        (void)column_ids;
+
+        auto shards = buildEstimateShards(*request, keyspace_id);
+        rust::Vec<bool> local_results;
+        [[maybe_unused]] auto snapshot = check_shards_and_acquire_snapshot(shards, local_results);
+        auto shard_ranges = buildEstimateShardRanges(*request, local_results);
+        if (shard_ranges.empty())
+            return grpc::Status::OK;
+
+        const auto estimate_result = estimate_count(keyspace_id, shard_ranges, query);
+        response->set_est_count(estimate_result.estimated_total_count);
+        LOG_INFO(
+            log,
+            "GetEstimateTiCICount done, est_count={}, input_shards={}, available_shards={}, sampled_shards={}",
+            response->est_count(),
+            request->shard_infos_size(),
+            estimate_result.available_shards,
+            estimate_result.sampled_shards);
+    }
+    catch (const pingcap::Exception & e)
+    {
+        LOG_WARNING(log, "GetEstimateTiCICount failed with KV exception: {}", e.message());
+        response->set_other_error(e.message());
+    }
+    catch (const std::exception & e)
+    {
+        LOG_WARNING(log, "GetEstimateTiCICount failed: {}", e.what());
+        response->set_other_error(e.what());
+    }
+    catch (...)
+    {
+        LOG_WARNING(log, "GetEstimateTiCICount failed with unknown exception");
+        response->set_other_error("other exception");
+    }
+
+    return grpc::Status::OK;
+}
+
 grpc::Status FlashService::tryAddLock(
     grpc::ServerContext * grpc_context,
     const disaggregated::TryAddLockRequest * request,
diff --git a/dbms/src/Flash/FlashService.h b/dbms/src/Flash/FlashService.h
index 0c87fa5493a..d4323131a6e 100644
--- a/dbms/src/Flash/FlashService.h
+++ b/dbms/src/Flash/FlashService.h
@@ -100,6 +100,10 @@ class FlashService
         const kvrpcpb::CompactRequest * request,
         kvrpcpb::CompactResponse * response) override;
 
+    grpc::Status GetEstimateTiCICount(
+        grpc::ServerContext * grpc_context,
+        const coprocessor::TiCIEstimateCountRequest * request,
+        coprocessor::TiCIEstimateCountResponse * response) override;
 
     // For S3 Lock Service
     grpc::Status tryAddLock(
diff --git a/dbms/src/Storages/Tantivy/TiCIReadTaskPool.h b/dbms/src/Storages/Tantivy/TiCIReadTaskPool.h
index 7d6df3745c1..c3054acd69f 100644
--- a/dbms/src/Storages/Tantivy/TiCIReadTaskPool.h
+++ b/dbms/src/Storages/Tantivy/TiCIReadTaskPool.h
@@ -171,6 +171,7 @@ struct TiCIReadTaskPool
     bool is_count;
     std::shared_ptr<rust::Box<ShardsSnapshot>> shards_snapshot;
 
+public:
     static std::tuple<::Expr, std::vector<ColumnID>> tipbToTiCIExpr(
         const tipb::Expr & expr,
         const TimezoneInfo & timezone_info)