diff --git a/README.md b/README.md
index c31182c..c51301a 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ eRum:warning("Some message with a term: ~p", [Term])
 ```erlang
 {eRum, [
    %% log_root是可选的，默认情况下文件路径是相对于CWD的
-   {log_root, "/var/log/hello"},
+   {logRoot, "/var/log/hello"},
    {handlers, [
       {lager_console_backend, [{level, info}]},
       {lager_file_backend, [{file, "error.log"}, {level, error}]},
@@ -101,7 +101,7 @@ below). If async values are not configured, no overload protection will be appli
 
 ```erlang
 [{eRum, [
-   {log_root, "/tmp"},
+   {logRoot, "/tmp"},
    %% Default handlers for lager/lager_event
    {handlers, [
       {lager_console_backend, [{level, info}]},
diff --git a/eRum.sample.config b/eRum.sample.config
index 2608741..4860621 100644
--- a/eRum.sample.config
+++ b/eRum.sample.config
@@ -38,7 +38,7 @@
 
       %% **********************************************  日志文件配置相关  ************************************************
       %% 可选的日志路径， 默认情况下是当前路径
-      {log_root, "./log"},
+      {logRoot, "./log"},
 
       %% crash log cfg
       %% 有效值 string | false
diff --git a/src/backend/rumBackendFile.erl b/src/backend/rumBackendFile.erl
index 33da295..2dfa8a1 100644
--- a/src/backend/rumBackendFile.erl
+++ b/src/backend/rumBackendFile.erl
@@ -98,7 +98,7 @@ init(LogFileConfig) when is_list(LogFileConfig) ->
          [RelName, Level, Date, Size, Count, Rotator, HighWaterMark, Flush, SyncInterval, SyncSize, SyncOn, CheckInterval, Formatter, FormatterConfig] =
             [proplists:get_value(Key, Config) || Key <- [file, level, date, size, count, rotator, high_water_mark, flush_queue, sync_interval, sync_size, sync_on, check_interval, formatter, formatter_config]],
          FlushThr = proplists:get_value(flush_threshold, Config, 0),
-         Name = rumUtil:expand_path(RelName),
+         Name = rumUtil:parsePath(RelName),
          schedule_rotation(Name, Date),
          Shaper = rumUtil:maybe_flush(Flush, #rumShaper{hwm = HighWaterMark, flushThreshold = FlushThr, id = Name}),
          State0 = #state{name = Name, level = Level, size = Size, date = Date, count = Count, rotator = Rotator,
@@ -950,13 +950,13 @@ filesystem_test_() ->
             LogName = "foo.log",
             LogPath = filename:join(TestDir, LogName),
 
-            application:set_env(lager, log_root, TestDir),
+            application:set_env(lager, logRoot, TestDir),
             {ok, _} = eRum:trace_file(LogName, [{module, ?MODULE}]),
             eRum:error("Test message"),
             %% not eligible for trace
             eRum:log(error, self(), "Test message"),
             {ok, Bin3} = file:read_file(LogPath),
-            application:unset_env(lager, log_root),
+            application:unset_env(lager, logRoot),
             ?assertMatch([_, _, "[error]", _, "Test message\n"],
                re:split(Bin3, " ", [{return, list}, {parts, 5}]))
          end},
diff --git a/src/crashLog/rumCrashLog.erl b/src/crashLog/rumCrashLog.erl
index 5bcbb43..214388c 100644
--- a/src/crashLog/rumCrashLog.erl
+++ b/src/crashLog/rumCrashLog.erl
@@ -36,13 +36,13 @@
    fileName :: string(),                        %% 文件名
    fd :: pid() | undefined,                     %% 文件句柄
    inode :: integer() | undefined,
-   ctime :: file:date_time() | undefined,
-   fmtmaxbytes :: integer(),
-   size :: integer(),
-   date :: undefined | string(),
-   count :: integer(),
-   flap = false :: boolean(),
-   rotator :: atom()
+   ctime :: file:date_time() | undefined,       %% 文件创建时间
+   fmtmaxbytes :: integer(),                    %% 单个消息最大字节数
+   size :: integer(),                           %% 单个日志文件最大字节数
+   date :: undefined | string(),                %% 旋转的时间格式
+   count :: integer(),                          %% 要保留的已轮转崩溃日志的数量
+   flap = false :: boolean(),                   %% ？？？？ 这是干啥的呢
+   rotator :: atom()                            %% 旋转模块
 }).
 
 start(Filename, MaxBytes, Size, Date, Count, Rotator) ->
@@ -54,7 +54,7 @@ start_link(Filename, MaxBytes, Size, Date, Count, Rotator) ->
 % File, MsgMaxBytes, RotationSize, RotationDate, RotationCount, RotationMod
 
 init({RelFilename, MaxBytes, Size, Date, Count, Rotator}) ->
-   Filename = rumUtil:expand_path(RelFilename),
+   Filename = rumUtil:parsePath(RelFilename),
    case Rotator:openLogFile(Filename, false) of
       {ok, {FD, Inode, Ctime, _Size}} ->
          schedule_rotation(Date),
diff --git a/src/eRum.erl b/src/eRum.erl
index 51f2dd3..610e835 100644
--- a/src/eRum.erl
+++ b/src/eRum.erl
@@ -259,7 +259,7 @@ trace_file(File, Filter, Options) when is_list(Options) ->
    trace_file(File, Filter, debug, Options).
 
 trace_file(File, Filter, Level, Options) ->
-   FileName = rumUtil:expand_path(File),
+   FileName = rumUtil:parsePath(File),
    case validate_trace_filters(Filter, Level, {lager_file_backend, FileName}) of
       {Sink, {ok, Trace}} ->
          Handlers = rumConfig:global_get(handlers, []),
diff --git a/src/utils/rumUtil.erl b/src/utils/rumUtil.erl
index c642650..fe36f14 100644
--- a/src/utils/rumUtil.erl
+++ b/src/utils/rumUtil.erl
@@ -21,7 +21,7 @@
    , is_loggable/3
    , trace_filter/1
    , trace_filter/2
-   , expand_path/1
+   , parsePath/1
    , find_file/2
    , check_hwm/1
    , check_hwm/2
@@ -479,28 +479,25 @@ is_loggable(Msg, SeverityThreshold, MyName) when is_integer(SeverityThreshold) -
    rumMsg:severity_as_int(Msg) =< SeverityThreshold orelse
       lists:member(MyName, rumMsg:destinations(Msg)).
 
-%% When log_root option is provided, get the real path to a file
-expand_path(RelPath) ->
-   RelPath2 = case application:get_env(lager, log_root) of
-                 {ok, LogRoot} when is_list(LogRoot) -> % Join relative path
-                    %% check if the given RelPath contains LogRoot, if so, do not add
-                    %% it again; see gh #304
-                    case filename:dirname(RelPath) of
-                       "." ->
-                          filename:join(LogRoot, RelPath);
-                       false ->
-                          RelPath
-                    end;
-                 undefined -> % No log_root given, keep relative path
-                    RelPath
-              end,
-   %% see #534 make sure c:cd can't change file path, trans filename to abs name
-   filename:absname(RelPath2).
+parsePath(RelPath) ->
+   NewRelPath =
+      case rumUtil:get_env(logRoot, undefined) of
+         undefined ->
+            RelPath;
+         LogRoot ->
+            case filename:dirname(RelPath) of
+               "." ->
+                  filename:join(LogRoot, RelPath);
+               false ->
+                  RelPath
+            end
+      end,
+   filename:absname(NewRelPath).
 
 %% Find a file among the already installed handlers.
 %%
 %% The file is already expanded (i.e. lager_util:expand_path already added the
-%% "log_root"), but the file paths inside Handlers are not.
+%% "logRoot"), but the file paths inside Handlers are not.
 find_file(_File1, _Handlers = []) ->
    false;
 find_file(File1, [{{lager_file_backend, File2}, _Handler, _Sink} = HandlerInfo | Handlers]) ->
@@ -853,20 +850,20 @@ mask_to_levels_test() ->
    ok.
 
 expand_path_test() ->
-   OldRootVal = application:get_env(lager, log_root),
+   OldRootVal = application:get_env(lager, logRoot),
 
-   ok = application:unset_env(lager, log_root),
-   ?assertEqual(filename:absname("/foo/bar"), expand_path("/foo/bar")),
-   ?assertEqual(filename:absname("foo/bar"), expand_path("foo/bar")),
+   ok = application:unset_env(lager, logRoot),
+   ?assertEqual(filename:absname("/foo/bar"), parsePath("/foo/bar")),
+   ?assertEqual(filename:absname("foo/bar"), parsePath("foo/bar")),
 
-   ok = application:set_env(lager, log_root, "log/dir"),
-   ?assertEqual(filename:absname("/foo/bar"), expand_path("/foo/bar")), % Absolute path should not be changed
-   ?assertEqual(filename:absname("log/dir/foo/bar"), expand_path("foo/bar")),
-   ?assertEqual(filename:absname("log/dir/foo/bar"), expand_path("log/dir/foo/bar")), %% gh #304
+   ok = application:set_env(lager, logRoot, "log/dir"),
+   ?assertEqual(filename:absname("/foo/bar"), parsePath("/foo/bar")), % Absolute path should not be changed
+   ?assertEqual(filename:absname("log/dir/foo/bar"), parsePath("foo/bar")),
+   ?assertEqual(filename:absname("log/dir/foo/bar"), parsePath("log/dir/foo/bar")), %% gh #304
 
    case OldRootVal of
-      undefined -> application:unset_env(lager, log_root);
-      {ok, Root} -> application:set_env(lager, log_root, Root)
+      undefined -> application:unset_env(lager, logRoot);
+      {ok, Root} -> application:set_env(lager, logRoot, Root)
    end,
    ok.