A hot swap circuit module for a switch system having a backplane. The module includes a circuit board and a latch circuit. The circuit board has a plurality of pins for inserting into the backplane. The latch, disposed on the circuit board, has a data input terminal for receiving an important signal, and a control terminal for receiving a clock signal to latch the important signal. The latch circuit is utilized to eliminate malfunction resulting from the disturbance voltage caused by hot swapping. Any circuit with latch function is allowed to be applied to the switch system of the present invention such that the switch system operates more stably without special pins or additional bus controller.