diff --git a/ZipDefine.h b/ZipDefine.h
index 341d7ba..58e0a00 100644
--- a/ZipDefine.h
+++ b/ZipDefine.h
@@ -2,6 +2,11 @@
 
 #include <cstdint>
 
+const static uint32_t PK_SIGNATURE_LF_HEADER = 0x04034b50;   // PK + 0x0403
+const static uint32_t PK_SIGNATURE_CENT_DIR = 0x02014b50;  // PK + 0x0201
+const static uint32_t PK_SIGNATURE_EO_CDR = 0x06054b50;     // PK + 0x0605
+const static uint16_t METHOD_UNCOMPRESSED = 0;
+
 /**   Overall .ZIP file format:
 
       [local file header 1]   -> "PK" + 0x4b50 + ...
@@ -61,8 +66,8 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
       uint16_t lengthOfFileName;
       uint16_t lengthOfExtraField;
 
-      // var[fileNameLength] fileName
-      // var[extraFieldLength] extraField
+      // var[lengthOfFileName] fileName
+      // var[lengthOfExtraField] extraField
  };
 
 /**   Central directory structure:
@@ -109,20 +114,20 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
       uint16_t lastModTime;   // 압축 시점의 시간 (1980년 기준 시간)
       uint16_t lastModDate;   // 압축 시점의 날짜 (1980년 기준 연도)
       uint32_t crc32;
-      uint32_t compressedSize;  // same as unCompression (cuz no compreesion)
-      uint32_t unCompressedSize;
-      uint16_t fileNameLength;
-      uint16_t extraFieldLength;
-      uint16_t fileCommentLength;
+      uint32_t sizeOfCompressed;  // same as unCompression (cuz no compreesion)
+      uint32_t sizeOfUncompressed;
+      uint16_t lengthOfFileName;
+      uint16_t lengthOfExtraField;
+      uint16_t lengthOfFileComment;
 
       uint16_t diskNumStart;
       uint16_t attributeInternal;
       uint32_t attributeExternal;
       uint32_t offsetLocalHeader;
 
-      // var[fileNameLength] fileName
-      // var[extraFieldLength] extraField
-      // var[fileCommentLength] fileComment
+      // var[lengthOfFileName] fileName
+      // var[lengthOfExtraField] extraField
+      // var[lengthOfFileComment] fileComment
 };
 
  /**  End of central directory record:
@@ -168,12 +173,11 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
 
       // .ZIP 파일 내 전체 파일 수
       uint16_t numOfEntries;
-      
       uint32_t SizeOfCentralDir;
       uint32_t OffsetOfCentralDirOffset;
       uint16_t LengthOfCommentLength;
 
-      // var[zipFileCommentLength] zipFileComment
+      // var[LengthOfCommentLength] zipFileComment
 };
 
 #pragma pack(pop)
diff --git a/main.cpp b/main.cpp
index 79618ec..adfae4c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,6 +5,8 @@
 #include "ZipDefine.h"
 #include "CRC.h"
 
+#define TARGET_FILE_NAME "MyZip.txt"
+
 bool ZipArchiver();
 uint32_t getCRC32(const uint8_t* pData, size_t length);
 
@@ -49,11 +51,11 @@ bool ZipArchiver()
 {
 	LocalFileHeader LFHeader = {};
 	CentralDirectory CentDir = {};
-	EoCDRecord ECDR = {};
+	EoCDRecord EOCDR = {};
 
 	using namespace std;
 
-	ifstream fileIn("MyZip.txt", ios::binary);
+	ifstream fileIn(TARGET_FILE_NAME, ios::binary);
 	bool iRet = fileIn.is_open();
 	if (!iRet)
 	{
@@ -75,13 +77,62 @@ bool ZipArchiver()
 		// Read
 		fileIn.read((char *)pFile, fileInSize);
 
-		// Get CRC value
-		// TODO : streamsize 와 size_t 의 mismatch (long long <-> unsigned long long)
-		uint32_t myCRC = getCRC32(pFile, fileInSize);
+		// ZIP 포맷 채워넣기
+		{
+			// Get CRC value
+			// TODO : streamsize 와 size_t 의 mismatch (long long <-> unsigned long long)
+			uint32_t myCRC = getCRC32(pFile, fileInSize);
 
-		// Put CRC value
-		LFHeader.crc32 = myCRC;
-		CentDir.crc32 = myCRC;
+			// Put PK Signature
+			LFHeader.signature = PK_SIGNATURE_LF_HEADER;
+			CentDir.signature = PK_SIGNATURE_CENT_DIR;
+			EOCDR.signature = PK_SIGNATURE_EO_CDR;
+			
+			// TOOD : versionMadeBy (Only CentDir)
+			// TODO : versionNeededToExtract
+			// TODO : generalBitFlag
+
+			// Put compressed method (uncompressed)
+			LFHeader.compressionMethod = METHOD_UNCOMPRESSED;
+			CentDir.compressionMethod = METHOD_UNCOMPRESSED;
+			
+			// TODO : lastMode[Time|Date]
+
+			// Put CRC value
+			LFHeader.crc32 = myCRC;
+			CentDir.crc32 = myCRC;
+
+			// Put File size
+			LFHeader.sizeOfUncompressed = (uint32_t)fileInSize;
+			CentDir.sizeOfUncompressed = (uint32_t)fileInSize;
+			LFHeader.sizeOfCompressed = LFHeader.sizeOfUncompressed;
+			CentDir.sizeOfCompressed = CentDir.sizeOfUncompressed;
+
+			// Put File name length
+			uint16_t fileNameLeng = strlen(TARGET_FILE_NAME);
+			LFHeader.lengthOfFileName = fileNameLeng;
+			CentDir.lengthOfFileName = fileNameLeng;
+
+			// Extra Field 는 사용하지 않음
+			// LFHeader.lengthOfExtraField = NOT_USED;
+			// CentDir.lengthOfExtraField = NOT_USED;
+
+			// TODO : CentDir 나머지 format
+			//			- lengthOfFileComment
+			//			- diskNumStart;
+			//			- attributeInternal;
+			//			- attributeExternal;
+			//			- offsetLocalHeader;
+
+			// TODO : EOCDR 나머지 format
+			//			- diskNumber
+			//			- diskNumber_CentralDirStart
+			//			- numOfCentralDir
+			//			- numOfEntries;
+			//			- SizeOfCentralDir;
+			//			- OffsetOfCentralDirOffset;
+			//			- LengthOfCommentLength;
+		}
 
 		// Free
 		free(pFile);