We report the experimental results of the inline phasecontrast imaging with a microfocus xray source. The minimized focused spot size of the xray source is about 05μm. According to the optical transfer function of the microfocus xray source, the effects of the size of the xray source, the coherent length of xray on the imaging resolution are discussed. The phasecontrast images of the fresh biomaterials are obtained with 10μm resolution. Compared with the absorptioncontrast image of the sample, the finestructure of the fresh biomaterials can be observed distinctly in the phasecontrast image.