Let be a order- and size- graph. Let be a 1-1 function from the set to Each edge , receives the label Then the function is called a difference cordial labelling if is and where and refers the number of edges having as its label and not having as its label respectively. If receives labeling which is a difference cordial is difference cordial graph. In this paper, the difference cordial for generalised Petersen graph is analysed and proved the existence of difference cordial.