We report the experimental results of the inline phasecontrast imaging with a microfocus xray source. The minimized focused spot size of the xray source is about 05μm. According to the optical transfer function of the microfocus xray source, the effects of the size of the xray source, the coherent length of xray on the imaging resolution are discussed. The phasecontrast images of the fresh biomaterials are obtained with 10μm resolution. Compared with the absorptioncontrast image of the sample, the finestructure of the fresh biomaterials can be observed distinctly in the phasecontrast image.