The disclosure relates to system and method for CT image reconstruction. The method may include: obtaining scanning data, wherein the scanning data is generated by at least one detector via a plurality of axial scans; obtaining a scanning parameter wherein the scanning parameter include a detector size; obtaining a requested reconstruction parameter; determining a plurality of requested image locations based on the scanning parameter and the requested reconstruction parameter; determining an intermediate reconstruction parameter based on the requested reconstruction parameter; determining a plurality of intermediate image locations based on the plurality of requested image locations and the intermediate reconstruction parameter; determining a intermediate image volume based on the plurality of intermediate images and the scanning data determining a final image volume based on the intermediate image volume and a filter; reconstructing an image of the subject based on the final image volume and the requested reconstruction parameters.