This paper discusses the feasibility of LEO satellite of fixation antenna and low or middle power accessing to the TDRSS and realizing space-ground data transmission through TDRS. The precondition of communication between LEO satellite and TDRS are given, then the general idea and method of computing the data throughout in bits and on day are provided by computer simulation, this method provides bases to test the feasibility of LEO satellites of fixation antenna accessing to the TDRSS.