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To realize the elliptic curve cryptography (ECC) effectively, the design method of modular multiplication based on optimized binary finite filed algorithm was presented. By the study of the binary finite fields, paralleled modular multiplication algorithm and inversion algorithm which was based on Euclidean algorithm were presented. The two algorithms were optimized during the process and then realized the fast evaluation of point multiplication by adopting Montgomery algorithm. ECC hardware implementation design was proposed based on the algorithm, and converted to logic designs using Verilog RTL, finally it worked on the XC7A100T FPGA platform of Xilinx. By pre-simulation, synthetical verification and analyzing the results of post simulation, the clock frequency of the designed circuit could reach up to 110MHz and the operating rate attained to 2.92 ms which demonstrated the feasibility and effectiveness of the project.