Abstract: A Virtual Laboratory for Space Physics（VLSP） is constructed based on Matlab Web Server and World-Wide Web（WWW） and the onboard data analysis system is briefly introduced.The concrete realization of the current sheet structure analysis module is addressed by employing a specific example.Applying the current sheet analysis module in VLSP，the flapping motion and the structure of the current sheet near reconnection diffusion region in the near-earth tail on August 6，2003 is studied in detail.The VLSP introduced here is well functioning and is apt to be extended to other facets，presenting great facilitation to researchers.