LCL-filter adopted in grid-connected inverter has its resonant issue meanwhile the capacitor is vulnerable under the impact of 5, 7 harmonic. To this end, a new LCL topology is proposed with two resonances introduced in its filter branch, i, e. a parallel one to get the capacitor protected and a serial one to decrease switching harmonics. The transfer function of filter branch current and grid voltage under the scheme is presented firstly, then the influence of filter capacitance perameters variation on tuning point of filter branch and the basic process of parameters selection are put forward. Comparison results considering novel LCL-filter and traditional LCL-filter are presented, which show that the novel topology can achieve almost the same damping effect as by traditional topology, meanwhile, getting the capacitor well protected and decreasing power loss caused by passive damping.