Synchronous vibration parameter identification is the key issue for the status monitoring and health management of rotating blades. The traditional two-parameter plot (2PP) method is earmarked for determining the amplitude and engine order of the blade synchronous vibration, the accuracy is limited by the measurement error of the blade tip-timing (BTT) technique, and the recognition range of engine order is constrained to the installation angles of probes. In this study, the arrival time and departure time of the blades are attained to establish the blade vibration differences, and then an improved blade vibration difference-based two-parameter plot (BVD-2PP) method is presented. The theoretical deduction, simulation analysis, and experimental research check the reliability and feasibility of the BVD-2PP method. The engine order obtained by the BVD-2PP method matches well with the strain results, and the amplitude identified by the BVD-2PP method deviates from the existing method by only 6.01 percent.