Beams with double-helix shaped focal spots are obtained by equally weighted linear superposition of Laguerre-Gauss(LG)beams. Five modes along the line with a slope of 3 in the modal plane are chosen for superposition, which increases the number of spirals in the double-helix focal spot, enhances the chirality, and broadens spectral bandwidth. However, side lobes simultaneously enhance, which results in severe adhesion of two main lobes during the process of two-photon polymerization. One optimization algorithm with the combination of double-Gaussian function and step function under the tight focusing condition is proposed here which can obviously suppress the side lobes and realize a phase-only mask. This phase-only mask is loaded on the spatial light modulator and a double-helix microstructure with both non-adhesion and more spirals is finally fabricated with a single exposure.