Abstract：EDA is the used of the computer to complete the design of electronic systems. The calculator based on EDA design, it main studies the 8-bit binary number of addition and subtraction operations, the two 4-bit binary number multiplication, 8-bit binary number divided by the number of four binary division, as well as implementation for continuous operation of addition and subtraction operations. The system selected Altera's MAX + Pluse Ⅱ as a hardware development platform, and the use of VHDL design languages. In the design process is used frequency division modules, the calculator is divided into four parts: calculate, storage, display and input part. The calculate is composed of four parts：addertion, subtraction, and multiplier and divider components. Storage part needs three memory to help achieved: internal accumulator (acc), input register (reg) as well as the results of registers (ans). Display part is made up three decoder of 7 sections, respectively to show the number of input. Input part has ten number keys, from 0 – 9, also has addition and subtraction and multiplication and division arithmetic operator keys, a button and of equal sign and the clear key, the design has to decode the key information (to be decimal digital conversion as a binary number), so that you can use these in the internal of calculator.
