An integrated circuit and an operating method thereof are provided. The integrated circuit includes memory cells, at least one first word line, second word lines, bit lines and write-assist bit lines. The at least one first word line is electrically connected to at least one row of the memory cells. The second word lines are electrically connected to other rows of the memory cells. Two bit lines are located between a column of the memory cells and two write-assist bit lines. The bit lines and the write-assist bit lines are configured to be electrically disconnected with each other when at least one of the memory cells electrically connected with the at least one first word line is configured to be written, and electrically connected with each other when at least one of the memory cells electrically connected to the second word lines is configured to be written.