A novel perspective slice method is proposed to solve the low resolution problem in reconstruction parallax images of holographic stereogram. The distance between holographic stereogram plane and viewing plane is set to be finite. A perspective slice is reconstructed by a holographic element (hogel), which is only a point in traditional holographic stereogram. The relationships between parallax image, perspective slice and the spectra of hogels are designed. The width of perspective slice is calculated from viewing distance and the size of hogels. The holographic stereogram with perspective slice is reconstructed by optical system based on a spatial light modulator (SLM). The experimental results demonstrate that the proposed method can enhance the resolution of the reconstruction parallax image by 8 times and represent the details of objects effectively. The influences of reconstruction distance to the quality of parallax images are analyzed.