diff --git a/operational b/operational
index 584f76319c64f61ad27446b085b176b22e518263..26455c7f6b4987866eab5cee07b1653d5916af58 100644
--- a/operational
+++ b/operational
@@ -85,12 +85,20 @@ cd ~/lisp/elisp/zero/
 ** 2019-11-10 关于屏幕闪烁，我临时解决方案是中文输入时，当光标到达半屏的时候，自动跳到首行，这样也方便一些，不过还是期待后续版本能解决这个问题
 * current                                                             :entry:
 ** 
-** 2019-11-10 space doesn't work in full-width mode.
 ** 2019-11-03 add completion support for zero-input-set-im
 complete registered im symbols.
 ** 2019-10-23 checkdoc and package-lint can't ignore some non-issues.
 I can't run them in git pre-commit hook.
 * done                                                                :entry:
+** 2019-11-10 space doesn't work in full-width mode.
+全角和半角 - 维基百科，自由的百科全书
+https://zh.wikipedia.org/wiki/%E5%85%A8%E5%BD%A2%E5%92%8C%E5%8D%8A%E5%BD%A2
+
+ascii   full-width unicode codepoint.
+0x20 	"　" 	U+3000
+
+- add a failing unit test.
+
 ** 2019-11-07 full width mode no longer works. why?
 C-c , . enabled full-width mode.
 but modeline is not changed.
diff --git a/zero-input-framework-test.el b/zero-input-framework-test.el
index 64ae8517baff044608e61235dba6e29296a49f99..21ff95fc552189f1835acb50480a82874bc2cfef 100644
--- a/zero-input-framework-test.el
+++ b/zero-input-framework-test.el
@@ -29,7 +29,8 @@
   (should (eq (zero-input-cycle-list '(a b c) 'd) nil)))
 
 (ert-deftest zero-input-convert-ch-to-full-width ()
-  (should (= (zero-input-convert-ch-to-full-width ?\!) ?\！)))
+  (should (= (zero-input-convert-ch-to-full-width ?\!) ?\！))
+  (should (= (zero-input-convert-ch-to-full-width ?\s) ?\u3000)))
 
 (ert-deftest zero-input-convert-str-to-full-width ()
   (should (string-equal "！" (zero-input-convert-str-to-full-width "!")))
diff --git a/zero-input-framework.el b/zero-input-framework.el
index 8df1fddcac0d3658e62a9eeb4f2c441937942026..52e09daa4c48635b0c9d4be2dcc4d6be20246af4 100644
--- a/zero-input-framework.el
+++ b/zero-input-framework.el
@@ -132,7 +132,7 @@ If item is not in lst, return nil."
 
 ;; zero-input-el version
 (defvar zero-input-version nil "Zero package version.")
-(setq zero-input-version "2.0.5")
+(setq zero-input-version "2.0.6")
 
 ;; FSM state
 (defconst zero-input--state-im-off 'IM-OFF)
@@ -352,13 +352,17 @@ COMPLETE-FUNC the function to call when build candidates completes."
     ;; update cache to make SPC and digit key selection possible.
     (funcall complete-func candidates)))
 
-(defvar zero-input-full-width-char-map
-  ;; ascii 33 to 126 map to
-  ;; unicode FF01 to FF5E
-  (cl-loop
-   for i from 33 to 126
-   collect (cons (make-char 'ascii i) (make-char 'unicode 0 255 (- i 32))))
+(defvar zero-input-full-width-char-map nil
   "An alist that map half-width char to full-width char.")
+(setq zero-input-full-width-char-map
+      (cons
+       ;; ascii 32 -> unicode 3000
+       (cons ?\s ?\u3000)
+       ;; ascii [33, 126] -> unicode [FF01, FF5E]
+       (cl-loop
+	for i from 33 to 126
+	collect (cons (make-char 'ascii i)
+		      (make-char 'unicode 0 255 (- i 32))))))
 
 (defun zero-input-convert-ch-to-full-width (ch)
   "Convert half-width char CH to full-width.
diff --git a/zero-input.el b/zero-input.el
index c99e8a93e424cca73f338ef3e11e2264d3fb4553..74677fb1f626049f1cd0668af93378bd76b400f3 100644
--- a/zero-input.el
+++ b/zero-input.el
@@ -12,7 +12,7 @@
 ;; See the License for the specific language governing permissions and
 ;; limitations under the License.
 
-;; Version: 2.0.5
+;; Version: 2.0.6
 ;; URL: https://gitlab.emacsos.com/sylecn/zero-el
 ;; Package-Requires: ((emacs "24.3") (s "1.2.0"))
 
@@ -243,7 +243,7 @@ If item is not in lst, return nil."
 
 ;; zero-input-el version
 (defvar zero-input-version nil "Zero package version.")
-(setq zero-input-version "2.0.5")
+(setq zero-input-version "2.0.6")
 
 ;; FSM state
 (defconst zero-input--state-im-off 'IM-OFF)
@@ -463,13 +463,17 @@ COMPLETE-FUNC the function to call when build candidates completes."
     ;; update cache to make SPC and digit key selection possible.
     (funcall complete-func candidates)))
 
-(defvar zero-input-full-width-char-map
-  ;; ascii 33 to 126 map to
-  ;; unicode FF01 to FF5E
-  (cl-loop
-   for i from 33 to 126
-   collect (cons (make-char 'ascii i) (make-char 'unicode 0 255 (- i 32))))
+(defvar zero-input-full-width-char-map nil
   "An alist that map half-width char to full-width char.")
+(setq zero-input-full-width-char-map
+      (cons
+       ;; ascii 32 -> unicode 3000
+       (cons ?\s ?\u3000)
+       ;; ascii [33, 126] -> unicode [FF01, FF5E]
+       (cl-loop
+	for i from 33 to 126
+	collect (cons (make-char 'ascii i)
+		      (make-char 'unicode 0 255 (- i 32))))))
 
 (defun zero-input-convert-ch-to-full-width (ch)
   "Convert half-width char CH to full-width.