Thermus aquaticus Taq polymerase is used in PCR. It's probably the most used of such enzymes.

thank you very much for your answer, but it's there are other enzymes, and how to determine their presence

There literatures describing thermophilic lipases, esterases and amylase (plus several other hydrolases) which are of industrial/comercial uses.

thank's for your answers

Thermophilic cellulases and xylanases are promising enzymes for the lignocellulosic bioconversion, other enzymes like arabinofurnosidase and xylosidase from thermophiles also have a wide application in biotechnology and industries

thank you Kandasamy

Anything that has some importance to better human life like: cellulase (in composting, chitinase etc.

thank you Ghosh for your answer

Everybody talks about polymerases and cellulase but there are still other enzymes that are very important in the biotechnological applications. For example screening and isolating of pectinase enzyme from thermophiles is very demanding and important. The procedure is very simple and since it is extra cellular enzyme, the production yield is also very high even without cloning the genes into vectors. Pectinase enzymes have high demands in extracting juice from purée during the process of wine production.Other benefits include Textile processing and bioscouring of cotton fibers, Degumming of plant bast fibers, Coffee and tea fermentation, Waste water treatment,Purification of plant viruses and many more.

I hope this will help

thank you very much Adhikari