Exhibit 10.13

Lock-Up Agreement

[ — ], 2010

NEWBRIDGE SECURITIES CORPORATION

777 So. Flagler Dr.

W. Palm Beach, FL 33401

BREAN MURRAY, CARRET & CO., LLC

570 Lexington Avenue

New York, New York 10022

as representatives of the several underwriters

Ladies and Gentlemen:

As an inducement to the underwriters (the “Underwriters”) to execute a underwriting agreement (the “Underwriting Agreement”) providing for a public offering (the “Offering”) of ordinary shares, par value $0.001 per share (the “Ordinary Shares”), of Tri-Tech Holding Inc., a Cayman Islands corporation (the “Company”), the undersigned hereby agrees that without, in each case, the prior written consent of each of Newbridge Securities Corporation and Brean Murray, Carret & Co., LLC (the “Representatives”) during the period specified in the second succeeding paragraph (the “Lock-Up Period”), the undersigned will not (1) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, make any short sale or otherwise transfer or dispose of, directly or indirectly, any Ordinary Shares or any securities convertible into, exercisable or exchangeable for or that represent the right to receive Ordinary Shares (including without limitation, Ordinary Shares which may be deemed to be beneficially owned by the undersigned in accordance with the rules and regulations of the Securities and Exchange Commission and securities which may be issued upon exercise of a stock option or warrant) whether now owned or hereafter acquired (the “Undersigned’s Securities”) or (2) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of the Undersigned’s Securities, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Ordinary Shares or such other securities, in cash or otherwise. The foregoing restriction is expressly agreed to preclude the undersigned from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the Undersigned’s Securities even if such Undersigned’s Securities would be disposed of by someone other than the undersigned. Such prohibited hedging or other transactions would include without limitation any short sale or any purchase, sale or grant of any right (including without limitation any put or call option) with respect to any of the Undersigned’s Securities or

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with respect to any security that includes, relates to, or derives any significant part of its value from such Undersigned’s Securities.

In addition, the undersigned agrees that, without the prior written consent of each of the Representatives, it will not, during the Lock-Up Period, make any demand for or exercise any right with respect to, the registration of any Ordinary Shares or any security convertible into or exercisable or exchangeable for Ordinary Shares.

The initial Lock-Up Period will commence on the date of this Lock-Up Agreement and continue and include the date 90 days after the date of the final prospectus used to sell Ordinary Shares in the Offering pursuant to the Underwriting Agreement (the “Prospectus Use Date”). The initial Lock-Up Period will be extended to the date 180 days after the Prospectus Use Date for 50% of the Undersigned’s Securities, provided, however, that if (1) during the last 17 days of the initial Lock-Up Period, the Company releases earnings results or material news or a material event relating to the Company occurs or (2) prior to the expiration of the initial Lock-Up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the initial Lock-Up Period, then in each case the Lock-Up Period will be extended further until the expiration of the 18-day period beginning on the date of release of the earnings results or the occurrence of the material news or material event, as applicable, unless each of the Representatives waives, in writing, such extension.

The undersigned hereby acknowledges that the Company will be requested to agree in the Underwriting Agreement to provide written notice to the undersigned of any event that would result in an extension of the Lock-Up Period pursuant to the previous paragraph and agrees that any such notice properly delivered will be deemed to have been given to, and received by, the undersigned. The undersigned further agrees that, prior to engaging in any transaction or taking any other action that is subject to the terms of this Lock-Up Agreement during the period from the date of this Lock-Up Agreement to and including the 34^th day following the expiration of the initial Lock-Up Period, it will give notice thereof to the Company and will not consummate such transaction or take any such action unless it has received written confirmation from the Company that the Lock-Up Period (as may have been extended pursuant to the previous paragraph) has expired.

Notwithstanding the foregoing, (1) the undersigned may transfer the Undersigned’s Securities (i) as a bona fide gift or gifts and (ii) to any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned, or (2) if the undersigned is a corporation, company, business trust, association, limited liability company, partnership, limited liability partnership, limited liability limited partnership or other entity (collectively, the “Entities” or, individually, the “Entity”), the undersigned may transfer Ordinary Shares or securities convertible into or exchangeable or exercisable for any Ordinary Shares to any Entity which is directly or indirectly controlled by, or is under common control with the undersigned and, if the undersigned is a partnership or limited liability company, it may transfer the Ordinary Shares or securities convertible into or exchangeable or exercisable for any Ordinary Shares to its partners, former partners or an affiliated partnership (or members, former members or an affiliated limited liability company) managed by the same manager or managing partner (or managing member, as the case may be) or management company, or managed by an entity controlling, controlled by, or under

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common control with, such manager or managing partner (or managing member) or management company in accordance with partnership (or membership) interests; provided, in each case of transfer pursuant to clause (1) or (2), that (x) such transfer shall not involve a disposition for value, (y) the transferee agrees in writing with the Underwriters to be bound by the terms of this Lock-Up Agreement, and (z) no filing by any party under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), shall be required or shall be made voluntarily in connection with such transfer. For purposes of this Lock-Up Agreement, “immediate family” shall mean any relationship by blood, marriage or adoption, nor more remote than first cousin.

In addition, the foregoing restrictions shall not apply to (i) the exercise of stock options granted pursuant to the Company’s equity incentive plans; provided that it shall apply to any of the Undersigned’s Securities issued upon such exercise, or (ii) the establishment of any contract, instruction or plan (a “Plan”) that satisfies all of the requirements of Rule 10b5-1(c)(1)(i)(B) under the Exchange Act; provided that no sales of the Undersigned’s Securities shall be made pursuant to such a Plan prior to the expiration of the Lock-Up Period (as such may have been extended pursuant to the provisions hereof), and such a Plan may only be established if no public announcement of the establishment or existence thereof and no filing with the Securities and Exchange Commission or other regulatory authority in respect thereof or transactions thereunder or contemplated thereby, by the undersigned, the Company or any other person, shall be required, and no such announcement or filing is made voluntarily, by the undersigned, the Company or any other person, prior to the expiration of the Lock-Up Period (as such may have been extended pursuant to the provisions hereof).

In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to decline to make any transfer of Ordinary Shares if such transfer would constitute a violation or breach of this Lock-Up Agreement.

The undersigned understands that the undersigned shall be released from all obligations under this Lock-Up Agreement if (i) the Company or the Underwriters inform the other that it does not intend to proceed with the Offering, (ii) the Underwriting Agreement does not become effective, or if the Underwriting Agreement (other than the provisions thereof which survive termination) shall terminate or be terminated prior to payment for and delivery of the Ordinary Shares to be sold thereunder, or (iii) the Offering is not completed by [—], 2010.

The undersigned understands that the Underwriters are entering into the Underwriting Agreement and proceeding with the Offering in reliance upon this Lock-Up Agreement.

This Lock-Up Agreement shall be governed by, and construed in accordance with, the laws of the State of New York.

Whether or not the Offering actually occurs depends on a number of factors, including market conditions. Any Offering will only be made pursuant to the Underwriting Agreement, the terms of which are subject to negotiation among the parties thereto.

[Signature page follows]

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The undersigned hereby represents and warrants that the undersigned has full power and authority to enter into this Lock-Up Agreement and that, upon request, the undersigned will execute any additional documents necessary in connection with the enforcement hereof. All authority herein conferred or agreed to be conferred and any obligations of the undersigned shall be binding upon the successors, assigns, heirs or personal representatives of the undersigned.

[Signature Page to Lock-Up Agreement]