-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MViJ6yEC83GGahpOSafuCizoFSOmSRvN+ntRIqbEjpExi1kO00DbIFyLQmtoPJaq
 +16NMb9Qr8oNcemzTW7WgA==

<SEC-DOCUMENT>0001019687-09-003411.txt : 20090923
<SEC-HEADER>0001019687-09-003411.hdr.sgml : 20090923
<ACCEPTANCE-DATETIME>20090923104505
ACCESSION NUMBER:		0001019687-09-003411
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090922
FILED AS OF DATE:		20090923
DATE AS OF CHANGE:		20090923

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cogo Group, Inc.
		CENTRAL INDEX KEY:			0000028367
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPONENTS & ACCESSORIES [3670]
		IRS NUMBER:				520466460
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		RM. 10001, TOWER C, SKYWORTH BUILDING
		STREET 2:		HIGH-TECH INDUSTRIAL PARK, NANSHAN
		CITY:			SHENZHEN
		STATE:			F4
		ZIP:			5180
		BUSINESS PHONE:		011.755.267.4327

	MAIL ADDRESS:	
		STREET 1:		RM. 10001, TOWER C, SKYWORTH BUILDING
		STREET 2:		HIGH-TECH INDUSTRIAL PARK, NANSHAN
		CITY:			SHENZHEN
		STATE:			F4
		ZIP:			5180

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Comtech Group Inc
		DATE OF NAME CHANGE:	20040916

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TRIDENT ROWAN GROUP INC
		DATE OF NAME CHANGE:	19960920

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DETOMASO INDUSTRIES INC
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Comtech Global Investment Ltd.
		CENTRAL INDEX KEY:			0001297606

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-02642
		FILM NUMBER:		091082073

	BUSINESS ADDRESS:	
		STREET 1:		COMTECH GLOBAL INVESTMENT LTD., RM. 1001
		STREET 2:		TOWER C, SKYWORTH BUILDING
		CITY:			NANSHAN
		STATE:			F4
		ZIP:			SHENZHEN
		BUSINESS PHONE:		011-755-2647327

	MAIL ADDRESS:	
		STREET 1:		COMTECH GLOBAL INVESTMENT LTD., RM. 1001
		STREET 2:		TOWER C, SKYWORTH BUILDING
		CITY:			NANSHAN
		STATE:			F4
		ZIP:			SHENZHEN
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-09-22</periodOfReport>

    <issuer>
        <issuerCik>0000028367</issuerCik>
        <issuerName>Cogo Group, Inc.</issuerName>
        <issuerTradingSymbol>COGO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001297606</rptOwnerCik>
            <rptOwnerName>Comtech Global Investment Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O COGO GROUP, INC - RM. 1001, TOWER C</rptOwnerStreet1>
            <rptOwnerStreet2>SKYWORTH BLDG, HIGH TECH INDUSTRIAL PARK</rptOwnerStreet2>
            <rptOwnerCity>NANSHAN, SHENZHEN</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>518057 PRC</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.01</value>
            </securityTitle>
            <transactionDate>
                <value>2009-09-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5.85</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9701524</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Yi Kang</signatureName>
        <signatureDate>2009-09-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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