Research on a single cell Multi-gap Resistive Plate Chamber (MR.PC) was carried out for the Time Of Flight detector (TOF) R. and D of the STAR. experi-ment. The property of the single chamber was tested with the test beam facility T10 at CERN in Geneva. The MRPC was scanned with the test beam to get the efficiency and time resolution at different position of the active area. The HV plateau was also measured. The time resolution is 65 ps which satisfies the requirement of STAR. The working mechanism of the MRPC is also explained.