Gallium-based liquid metal is fabricated from non-toxic metals including gallium, indium, tin, zinc and silver. As a flowable metal featuring high thermal and electrical conductivity, deformability, and dual controllability via electric current and electromagnetic fields, room-temperature liquid metal serves as an ideal alternative to thermal grease for CPU and GPU heat dissipation. It can also be applied to heat management for IGBTs, high-power LEDs and power batteries, enabling sufficient interfacial filling and low thermal resistance.