LOCK-UP AGREEMENT


October 31, 2005


Purchasers referred to below :


Re: Securities Purchase Agreement dated October 21, 2005 (the "Agreement ') by and among, China Expert Technology, Inc ., (the "Company") and the purchasers signatory thereto (each, a "Purchaser" and collectively referred to as
the "Purchasers")

	
Ladies and Gentlemen :





     Defined terms not otherwise defined herein (the " Letter Agreement") shall have the meanings set forth in the Agreement. Pursuant to Section 2 .2(a) of the Agreement and in satisfaction of a condition
of the Purchasers' obligations under the Agreement, the undersigned irrevocably agrees with the Purchasers that, from the date hereof until the date that all Debentures have been fully converted or paid in full (such period, the "Restriction
Period"), the undersigned will not offer, sell, contract to sell, pledge or otherwise dispose of, (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or
effective economic disposition due to cash settlement or otherwise) by the undersigned or any affiliate of the undersigned or any person in privity with the undersigned or any affiliate of the undersigned), directly or indirectly, including the
filing (or participation in the filing) of a registration statement with the Commission in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the
Exchange Act and the rules and regulations of the Commission promulgated thereunder with respect to, any shares of Common Stock beneficially owned, held or hereafter acquired by the undersigned (the " Securities"). Beneficial ownership shall be
calculated in accordance with Section 13(d) of the Exchange Act . In order to enforce this covenant, the Company will impose irrevocable stop-transfer instructions preventing the transfer agent from effecting any actions in violation of this
agreement.


     The undersigned acknowledges that the execution, delivery and performance of this letter agreement is a material inducement to the Purchasers to complete the transaction contemplated by the Purchase
Agreement and that the Purchasers (which shall be third party beneficiaries of this letter agreement) and the Company shall be entitled to specific performance of my obligations hereunder. The undersigned hereby represents that the undersigned has
the power and authority to execute, deliver and perform this letter agreement, that the undersigned has received adequate consideration therefor and that the undersigned will indirectly benefit from the closing of the transactions contemplated by
the Purchase Agreement .


     This letter agreement may not be amended or otherwise modified in any respect without the written consent of each of the Company, the Purchasers and the undersigned. This letter agreement shall be
construed and enforced in accordance with the laws of the State of New York, without regard to the principles of conflicts of laws . The undersigned hereby irrevocably submit to the exclusive jurisdiction of the state and federal courts sitting in
the City of New









York, Borough of Manhattan, for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby irrevocably waive, and agree not to assert in any
suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, or that such suit, action or proceeding is improper. The undersigned hereby irrevocably waives personal service of process and consents to
process being served in any such suit, action or proceeding by receiving a copy thereof sent to the Company at the address in effect for notices to it under the Purchase Agreement and agrees that such service shall constitute good and sufficient
service of process and notice thereof. The undersigned hereby waives any right to a . trial . by jury. Nothing contained herein shall be deemed to limit in any way any right to serve process in any manner permitted by law. The undersigned agrees and
understands that this letter does not intend to create any relationship between the undersigned and the Purchasers and that the Purchasers are not entitled to cast any votes on the matters herein contemplated and that no issuance or sale of the
Securities is created or intended by virtue of this letter.


     By its signature below, the Company's transfer agent hereby acknowledges and agrees that it has placed an irrevocable stop transfer instruction on all Securities beneficially owned by the undersigned,
reflecting this Letter Agreement, until the end of the Restriction Period . This Letter Agreement shall be binding on successors and assigns of the undersigned with respect to the Securities and any such successor or assign shall enter into a
similar agreement for the benefit of the Purchasers.



*** SIGNATURE PAGE FOLLOWS** *


2








C#INAnItIhfJNVESTMENT
GROUP LIMITED .


CHINA UNK INVESTMENT GROUP LIMITED








Director


Position in China Link Investment Group Limited


Address for Notice :


Room 2703-4, Great Eagle Centre 23 Harbour Road, Wahchai ,


Hong Kong

	
2,270,59 5

Number of shares of Common Stock





0







Number of shares of Common Stock underlying subject to warrants, options, debentures or other convertible securities


     By signing below, the Company agrees to enforce the restrictions on transfer set forth in this letter agreement.

	
CHINA EXPERT TECHNOLOGY, INC .















This letter agreement may be executed in two or more counterparts, all of which when taken together may be considered one and the same agreement .







	
Authorized Signature

Lai Man Yuk

Print Name

Director

Position in China Data Holdings Ltd ,

Address for Notice:

Room 2703-4, Great Eagle Centre

23 Harbour Road, Wahchai ,

Hong Kong!

9,967,500

Number of shares of Common Stock





0






Number of shares of Common Stock underlying subject to warrants, options, debentures or other convertible securities











	
Acknowledged and agreed io

as of the date set forth above:




	
MAJ)ISON STOCK TRANS PER INC.