diff --git a/frontend/util.lua b/frontend/util.lua
index c9ebae5e0..2272e9feb 100644
--- a/frontend/util.lua
+++ b/frontend/util.lua
@@ -117,6 +117,16 @@ function util.splitToChars(text)
     return tab
 end
 
+-- Test whether c is a CJK character
+function util.isCJKChar(c)
+    return string.match(c, "[\228-\234][\128-\191].") == c
+end
+
+-- Test whether str contains CJK characters
+function util.hasCJKChar(str)
+    return string.match(str, "[\228-\234][\128-\191].") ~= nil
+end
+
 --- Split text into a list of words, spaces and punctuations.
 ---- @string text text to split
 ---- @treturn table list of words, spaces and punctuations
@@ -124,7 +134,7 @@ function util.splitToWords(text)
     local wlist = {}
     for word in util.gsplit(text, "[%s%p]+", true) do
         -- if space splitted word contains CJK characters
-        if word:match("[\228-\234][\128-\191]+") then
+        if util.hasCJKChar(word) then
             -- split with CJK characters
             for char in util.gsplit(word, "[\228-\234\192-\255][\128-\191]+", true) do
                 table.insert(wlist, char)
@@ -138,7 +148,7 @@ end
 
 -- Test whether a string could be separated by a char for multi-line rendering
 function util.isSplitable(c)
-    return c == " " or string.match(c, "%p") ~= nil
+    return util.isCJKChar(c) or c == " " or string.match(c, "%p") ~= nil
 end
 
 return util
diff --git a/spec/unit/util_spec.lua b/spec/unit/util_spec.lua
index 7a57fc87f..7ebdbf6e6 100644
--- a/spec/unit/util_spec.lua
+++ b/spec/unit/util_spec.lua
@@ -106,4 +106,24 @@ describe("util module", function()
         })
     end)
 
+    it("should split text to line - CJK", function()
+        local text = "彩虹是通过太阳光的折射引起的。"
+        local word = ""
+        local table_of_words = {}
+        local c
+        local table_chars = util.splitToChars(text)
+        for i = 1, #table_chars  do
+            c = table_chars[i]
+            word = word .. c
+            if util.isSplitable(c) then
+                table.insert(table_of_words, word)
+                word = ""
+            end
+            if i == #table_chars then table.insert(table_of_words, word) end
+        end
+        assert.are_same(table_of_words, {
+            "彩","虹","是","通","过","太","阳","光","的","折","射","引","起","的","。",
+        })
+    end)
+
 end)