Abstract: As in a large scale coal preparation plant, the amount of slime water processingrequirements of higher, more application of large diameter thickener. Temperatureeffect in the design of large diameter thickening pool has become the decisive factor. And several major norms such as: 《Load Standard》、《Drainage Standard 》、《Drainage Rules》 on the temperature the calculation principle and method is not clear enough, designers often due to short design cycle factors did not do a carefulanalysis of temperature effect due to temperature effect, the lack of consideration,the crack control is not strict, resulting in large diameter thickening tank leakagecontent exceed the standard, that affect the structural safety of concentration tankand pollution of the environment. Above the specifications, manuals and SAP2000 finite element analysis based on the calculation of the two main types oftemperature under the action of Φ 35m diameter thickener, analysis shows that the necessity of full consideration of the correct temperature effects, and puts forward some design and construction suggestions, in order to provide references for designers.