We use the stress energy function suggested by van der Hoek et al. to simulate the formation of dislocation hollow cores. Both average formation energy of the solid-fluid bond ω and driving force △μ affect the formation of hollow cores greatly. The relation between radius of hollow core and diffussion is expressed by the back-force effect. The results of our Monte-Carlo simulation show that a straight step passing a dislocation will be retarded by the stress field.