By analyzing the basic principle of Solc filter,it was concluded that the filter can be tuned by varying optical path difference of uniaxial crystal. As nematic liquid crystal provided with electric-control birefringent effect,a tunable Solc filter using parallel nematic liquid crystal cell as electric-control birefringent phase element was put forward. One representative form of six-patch fan structure has been designed and fabricated. Experimental results revealed a good tuning ability of the device. A tuning range of 450-650 nm with spectral resolution of less than 93 nm and a 550-650 nm tuning range with spectral resolution of 20 nm were obtained. The Solc filter has the advantages of high transmission and few sidelobes,and can be applied in high transmission requiring cases.