diff --git a/be/src/http/action/stream_load.cpp b/be/src/http/action/stream_load.cpp
index 55541843241dbc..99a98afbc37b8d 100644
--- a/be/src/http/action/stream_load.cpp
+++ b/be/src/http/action/stream_load.cpp
@@ -398,9 +398,19 @@ Status StreamLoadAction::_process_put(HttpRequest* http_req,
         request.__set_line_delimiter(http_req->header(HTTP_LINE_DELIMITER));
     }
     if (!http_req->header(HTTP_ENCLOSE).empty() && http_req->header(HTTP_ENCLOSE).size() > 0) {
+        const auto& enclose_str = http_req->header(HTTP_ENCLOSE);
+        if (enclose_str.length() != 1) {
+            return Status::InvalidArgument("enclose must be single-char, actually is {}",
+                                           enclose_str);
+        }
         request.__set_enclose(http_req->header(HTTP_ENCLOSE)[0]);
     }
     if (!http_req->header(HTTP_ESCAPE).empty() && http_req->header(HTTP_ESCAPE).size() > 0) {
+        const auto& escape_str = http_req->header(HTTP_ESCAPE);
+        if (escape_str.length() != 1) {
+            return Status::InvalidArgument("escape must be single-char, actually is {}",
+                                           escape_str);
+        }
         request.__set_escape(http_req->header(HTTP_ESCAPE)[0]);
     }
     if (!http_req->header(HTTP_PARTITIONS).empty()) {
diff --git a/be/src/vec/exec/format/csv/csv_reader.cpp b/be/src/vec/exec/format/csv/csv_reader.cpp
index ea16234e016632..d91e28eb95f535 100644
--- a/be/src/vec/exec/format/csv/csv_reader.cpp
+++ b/be/src/vec/exec/format/csv/csv_reader.cpp
@@ -738,11 +738,21 @@ Status CsvReader::_line_split_to_values(const Slice& line, bool* success) {
                         fmt::format_to(error_msg, "{} {} {}",
                                        "actual column number in csv file is ", cmp_str,
                                        " schema column number.");
-                        fmt::format_to(error_msg, "actual number: {}, column separator: [{}], ",
-                                       _split_values.size(), _value_separator);
-                        fmt::format_to(error_msg,
-                                       "line delimiter: [{}], schema column number: {}; ",
-                                       _line_delimiter, _file_slot_descs.size());
+                        fmt::format_to(error_msg, "actual number: {}, schema column number: {}; ",
+                                       _split_values.size(), _file_slot_descs.size());
+                        fmt::format_to(error_msg, "line delimiter: [{}], column separator: [{}], ",
+                                       _line_delimiter, _value_separator);
+                        if (_enclose != 0) {
+                            fmt::format_to(error_msg, "enclose:[{}] ", _enclose);
+                        }
+                        if (_escape != 0) {
+                            fmt::format_to(error_msg, "escape:[{}] ", _escape);
+                        }
+                        fmt::memory_buffer values;
+                        for (const auto& value : _split_values) {
+                            fmt::format_to(values, "{}, ", value.to_string());
+                        }
+                        fmt::format_to(error_msg, "result values:[{}]", fmt::to_string(values));
                         return fmt::to_string(error_msg);
                     },
                     &_line_reader_eof));