Abstract： The spatial behaviors of solutions for a class of thermoelastic plates with biharmonic operatorР were studied in the paper. Firstly，the functional expression for solutions was constructed，and then theР differential inequality which met that the functional expression was able to be controlled by its first derivativeР was derived. Finally，the Phragmén-Lindelöf alternative results for the solutions were obtained. These resultsР could be regarded as the applications of the Saint-Venant principle to hyperbolic- parabolic coupled equations.Р Key words： thermoelastic plates； Phragmén-Lindelöf alternative； Saint-Venant principle； biharmonicР equationРРР 【责任编辑 乔子栩】
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