In university physics experiments，measurement the coefficient of thermal conductivity of object is clamped the object in the middle of two copper plates．The upper copper plate is a heating plate，and the lower copper plate is a cooling plate．Each of the copper plates has a hole for measuring temperature．According to the actual height of the measured object，the higher object will also have the upper and lower temperature measurement holes．Due to the experimental operation process involved in clamping the measured object，the dynamic balance of heat transfer between the heating plate and the measured object and the cooling plate，the accuracy of temperature measurement and other operations，mistakes are possible at every step．Some possible problems in the experimental operation are discussed．