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In order to achieve an execution controller which can complete the Plus/minus, multiply and divide floating point calculation function independently, this paper proposes a parallel operation based on the FPGA circuit hard-wired floating-point number operation control circuit and the sequential control method. The controller can automatically select arithmetic unit, adjust the internal clock of the sequential pulse cycle,independently complete configuration of the operands and the function of floating-point addition/subtraction, multiplication operation,. operation results transmitted to the system data bus. Discusses the circuit of the controller structure and basic principle, analyzes the operand configuration and the choice of the arithmetic unit under the action of execution. VerilogHDL language is applied to implement the building and related hardware connection. After the completion of the design the simulation test shows that the single instruction controller can independently complete the floating-point Plus/minus, multiply and divide. 