Abstract: A combination weighing and packing system including a combination weighing machine and a packing machine which are functionally interlocked with each other so that batches of product weighed out by the weighing machine in accordance with a prescribed weight condition are packed successively in bags by the packing machine, and a common control unit having a display screen and a keyboard, which stores a number of operation parameters of the weighing and packing machines which are selectively displayed on the screen and can be changed or corrected easily by keyboard operation of an operator.