Summary: The OR-Coincidence (OC) expansion and the RM expansion of logical function are analyzed and then the relationship between the $b_j$ expansion coefficients and the $d_j$ expansion coefficients is deduced by the use of the properties of Exclusive-OR (XOR) and OC operations. Based on it, two graphic transformation methods between $d_j$ map and $b_j$ map based on the folding XOR and the center of gravity, respectively, are proposed and compared. Their advantages such as intuition, effectiveness and so on are shown by the use of examples.