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Linear block code is an important kind of error correction code, which is used to reduce Bit Error Rate (BER) and so to improve the reliability of digital signal transfer. This design which is based on the WindowsXp platform, using Graphic editor and text editor of MAX+PLUS II, to design Linear block code through VHDL and Combinational logic. both of these realization are simulated. Combinational Logic design which based on the theory of Linear block code is the circuit map of Linear block code using AND-gate, OR-gate, Flip-flop and so on. VHDL design is the hardware description of the circuit map to make linear block code into realization. this design describes the function of (7,4) linear block code in detail. when a set of 4 serial bits signal flows into linear block code, check bits are added to the signal, thus, a new serial sequence is born, which the first 4 bits are information, the last 3 bits are check bits. Those 3 bits is used to discover and correct error bit. this des