Dendrimers performed potential advantages in constructing low dielectric constant (low-k) materials owing to the enhanced molecular free volume in their unique branched structure. Moreover, the chains or terminals of dendrimers could be designed as low polar functional groups such as phenyl, cycloalkyl and heterocycle or as low polar chemical bonds including Si-C and C-F. Furthermore, the low-k dendrimers show good solubility, excellent film-forming property and temperature resistance due to their repetitive units. Low-k dendrimers have promising applications in high-performance electronic products. Herein, the application of low-k dendrimers was summarized as follows: photoresist, binder, insulating materials, heat-resistant materials and flame retardant materials.