The transport properties in various complex solids are of great importance for both fundamental science research and realistic applications. In recent years, I systematically investigated electrical transport, thermal transport, and thermoelectric transport in many complex solids like inorganic amorphous materials, organic materials, and organic-inorganic hybrid materials. Multiple theories and methods such as the Green's function method, the Monte Carlo method, the Boltzmann equations, the dynamical mean-field theory, the molecular dynamics, the first-principle calculations, and the random walk method were used in our investigations. Several new theories and concepts are proposed.