In order to solve the problem of temperature measurement at high temperature above 200℃ and provide technical support for high-temperature geothermal and hot dry rock exploration， a storage high temperature and high pressure borehole thermometer was developed by using platinum resistance temperature measurement technology and vacuum insulation technology. The instrument is designed for working environment temperature of 300℃ and water pressure resistance of 100MPa. It can be used for borehole temperature measurement at high temperature and high pressure. The instrument has been used in Huire-1 well and GH-01 well，which can meet the borehole temperature measurement requirements.