POWER OF ATTORNEY


	The undersigned, Tse Wen Chang, a direcotr of
Tanox, Inc., a Delaware Corporation ("Tanox"), hereby designates Nancy T.
Chang, John Blickenstaff and Katie-Pat Bowman, and each of them, his true
and lawful attorney-in-fact and agent, with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all Forms 3, 4 and 5, including amendments
thereto, disclosing changes in his beneficial ownership of securities and
derivative securities of Tanox and to file the same with the Securities and
Exchange Commission, granting said attorney-in-fact and agent, and any of
them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as
fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent, or any
of them, or his or their substitute or substitutes, may lawfully do or
cause to be done by virtue hereof. This power of attorney shall remain
effective for so long as I am subject to the reporting requirements of
Section 16(a) promulgated under the Securities Exchange Act of 1934 or
until earlier revoked by the undersigned.



Date:  September 20,
20000			    Tse Wen Chang