Abstract: Technological use is an important feature of todays society with uncertainty serving as one of its basic characteristics. Accordingly， it is of great significance to take into account the uncertainty in technological use when expanding the areas of technological philosophy. From the dimension of technological object， such uncertainty mainly shows the possibility of technological function disorder; from the dimension of technological subject， it is mainly manifested by the possibility of technological function innovation; from the dimension of technological target， it mainly shows the possibility of technological target deviation; and from the dimension of technology activity， it is mainly represented by the possibility of technological risk forming. It is therefore argued that the varied manifestations of the uncertainty in technological use derive from different factors.

Key words: technological use, uncertainty, technological function, technological target, technological risk