The exploration of deep mineral resources is an important aspect of strategic mineral resources exploration. An overview of prospecting practice has proved that geochemical exploration methods and techniques have played an important and indispensable role in mineral exploration and even deep ore prospecting. With the intensification of prospecting work and the increasing difficulty of prospecting, geochemical exploration methods and techniques have been developed and improved continuously. Advances on traditional methods and techniques have resulted in the development of many new methods and techniques. From the perspective of methodology and system theory, this paper systematically inducts and summarizes the existing effective geochemical exploration methods and techniques for finding deep hidden ores, and puts forward the concept of threedimensional geochemical exploration method and technique system. The threedimensional geochemical exploration methods and techniques are divided into surface geochemical measurement methods and underground geochemical measurement methods, and a threedimensional geochemical exploration method and technique system for deep mineral resources has been established. Different methods and techniques have different advantages and different applicable conditions. In actual work, different combinations of threedimensional methods and techniques should be selected according to different exploration stages, different exploration purposes and diverse geological and geochemical conditions in order to obtain maximum benefit and achieve the maximum effect.