An Amendment Agreement is made on May 9, 2007 Among

EXHIBIT 4.1

An Amendment Agreement is made on May 9, 2007

Among

(1) SIHITECH COMPANY LIMITED, a company with limited liability established and existing pursuant to the laws of the British Virgin Islands (BVI) whose registered office is at TrustNet Xxxxxxxx, P.O. Box 3444, Road Town, Tortola, British Virgin Islands;

(2) MEGA CAPITAL GROUP SERVICES LIMITED, a company with limited liability established and existing pursuant to the laws of the BVI whose registered office is at TrustNet Xxxxxxxx, P.O. Box 3444, Road Town, Tortola, British Virgin Islands;

(3) PROFIT LOYAL CONSULTANTS LIMITED, a company with limited liability established and existing pursuant to the laws of the BVI whose registered office is at TrustNet Xxxxxxxx, X.X. Xxx 0000, Xxxx Xxxx, Xxxxxxx, Xxxxxxx Xxxxxx Xxxxxxx;

(4) ELITE CONCORD INTERNATION LIMITED, a company with limited liability established and existing pursuant to the laws of the BVI whose registered office is at TrustNet Xxxxxxxx, P.O. Box 3444, Road Town, Tortola, British Virgin Islands;

(5) CHINA CENTURY HOLDINGS GROUP LIMITED, a company with limited liability established and existing pursuant to the laws of the BVI whose registered office is at TrustNet Xxxxxxxx, X.X. Xxx 0000, Xxxx Xxxx, Xxxxxxx, Xxxxxxx Xxxxxx Xxxxxxx;

(6) SHINING GROUTH INVESTMENT GROUP LIMITED, a company with limited liability established and existing pursuant to the laws of the BVI whose registered office is at TrustNet Xxxxxxxx, P.O. Box 3444, Road Town, Tortola, British Virgin Islands;

(7) YUCHENG TECHNOLOGIES LIMITED, a wholly owned subsidiary of CUAQ and a company incorporated under the laws of the BVI whose registered office is at Xxxx 0000, Xxxxxxxx Xxxxxx 00-00 Xxxxx'x Xxxx Xxxx, Xxxxxxx, Xxxx Xxxx S.A.R. and successor to CHINA UNISTONE ACQUISITION CORP., a corporation formerly organized under the laws of the State of Delaware;

(8) XXXX XXXXXX;

(9) XXXXX XX; and

(10) XXXXX XXXXXXXXX;

Whereas

The Parties have signed an agreement for sale and purchase of shares of Ahead Billion Venture Limited and Port Wing Development Company Limited as of December 20, 2005, as amended (the SPA).

It is agreed as follows:

1. The Parties agree that Section 2.2 (c) (ii) (b) shall be deleted and replaced by the following:

“773,045 ordinary shares of CUAQ Sub, no par per share, to the Sihitech Holdingscos, at Closing. If the net profit as shown in the pro forma table in the notes to the audited consolidated financial statements of CUAQ Sub and its subsidiaries for the year ended December 31, 2006, plus all the Public Company Compliance Expenses, is lower than US$6,073,941, the Sihitech Holdingcos shall, on a joint and several basis, promptly return the certificates representing 773,045 shares of CUAQ Sub Stock for no additional consideration”; and

2. The Parties agree that except as amended hereby, the provisions of the SPA, as previously amended, are confirmed and shall remain unchanged and shall continue in full force and effect.

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed as of the date first written above.

For and on behalf of			For and on behalf of
Sihitech Company Limited			Elite Concord International Limited
By:	/s/ HONG Weidong		By:	/s/ XXXX Xxxx
	Name: HONG Weidong			Name: XXXX Xxxx
	Title: Authorized Representative			Title: Authorized Representative
For and on behalf of			For and on behalf of
Mega Capital Group Services Limited			China Century Holdings Group Limited
By:	/s/ XXXX Xxxxxx		By:	/s/ ZHONG Mingchang
	Name: XXXX Xxxxxx			Name: ZHONG Mingchang
	Title: Authorized Representative			Title: Authorized Representative
For and on behalf of			For and on behalf of
Profit Loyal Consultants Limited			Shinning Growth Investment Group Limited
By:	/s/ MA Gehua		By:	/s/ XXXX Xx
	Name: MA Gehua			Name: XXXX Xx
	Title: Authorized Representative			Title: Authorized Representative
	/s/ Xxxx Xxxxxx		For and on behalf of
	Xxxx Xxxxxx		Yucheng Technologies Limited
	/s/ Xxxxx Xxxxxxxxx		By:	/s/ Xxxx Xxxxxx
	Xxxxx Xxxxxxxxx			Name: Xxxx Xxxxxx
				Title: Director
				/s/ Xxxxx Xx
				Xxxxx Xx