diff --git a/Readme.md b/Readme.md
new file mode 100644
index 0000000..4c7fcd4
--- /dev/null
+++ b/Readme.md
@@ -0,0 +1,40 @@
+ENGLISH:
+
+Click to open KNZ_Convert_en_us_ver_1.0.6.exe of english version.
+
+Using method
+
+Click "Single file convert" or "Batch files convert", input the RINEX file of version of 2.10 or 2.11.
+
+If not click the output diectory, the converted file will generate at the same directory of original file, 
+the file name of converted file is "COV-{originalfilename}"
+
+The converted file will note the version of convert at the heder of file.
+
+The converted file own some traits as below:
+
+1. Conversion does not require additional parameter information,
+	the file is lossless conversion, only convert the foemat,
+	do not modify the information. 
+2. For the obsrved value types ofdifferent frequency hands in the original file,
+	the software will automatically match and general default is the conversion table at the end of the readme
+
+
+SYSTEM	  |	FREQ.BAND	FREQUENCY   | 2.11 || 2.10 CODE   ->	  3.04 CODE             |
+
+GPS		  | L1          1575.42 	| [C, L, D, S] 1,P1   -> 	  [C, L, D, S]1C, C1P   |
+		  | L2		    1227.60	    | [C, L, D, S] 2,P2   ->      [C, L, D, S]2C, C2P   |
+		  | L5          1176.45	    | [C, L, D, S] 5      -> 	  [C, L, D, S]5I        |
+
+GLONASS	  | G1		    1602+K*9/16 | [C, L, D, S] 1,P1   ->      [C, L, D, S]1C, C1P   |
+		  | G2		    1246+K*7/16 | [C, L, D, S] 2,P2   -> 	  [C, L, D, S]2C, C2P   |
+
+Galileo	  | E2-L1-E1    1575.42	    | [C, L, D, S] 1      ->      [C, L, D, S]1C        |
+		  | E5a		    1176.45	    | [C, L, D, S] 5      ->      [C, L, D, S]5I        |
+		  | E5b	        1207.140    | [C, L, D, S] 7      ->      [C, L, D, S]7I        |
+		  | E5a+b	    1191.795    | [C, L, D, S] 8      ->      [C, L, D, S]8I        |
+		  | E6		    1278.75	    | [C, L, D, S] 6      ->      [C, L, D, S]6C        |
+
+SBAS	  | L1		    1575.42	    | [C, L, D, S] 1      ->      [C, L, D, S]1C        |
+		  | L5		    1176.45	    | [C, L, D, S] 5      ->      [C, L, D, S]5I        |
+