The disclosed filter is multi-tuned filter including two sets of terminal pair for frequency selection with passive electric elements as network elements. The multi-tuned filter is composed of a LC series resonance branch cascaded to 1-2 pieces of LC parallel resonance branch. Characters are that capacitor C1 is composed of equivalent two capacitors C0 and C1úºconnected in series; the cascaded node (a)of two equivalent capacitors C0 and C1úºto ground (d) or to the cascaded node (b) of LC parallel resonance loop constitute two sets of terminal pair in network. Damping resistance R1 is connected to network of two sets of terminal pair in parallel so as to form series resonance loop at fundamental frequency point. The invention possesses notable effect of low fundamental loss of electrical energy.