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A strategy on gear optimization is designed to solve the problem of shift cycle for the vehicles equipped with Dual-Clutch Transmission, which adopt two-parameter shift schedule when driving on the slope. Firstly, based on the longitudinal vehicle dynamics model, the road slope is estimated in real-time using Lagrange interpolation algorithm. Furthermore, the slope shift factor is established based on fuzzy theory , thus to optimize the vehicles’ gear when driving on the slope. A simulation and analysis is carried out on the proposed gear optimization strategy. The simulation result shows that the gear can be determined effectively by this strategy according to the estimated slope .which not only solved the shift cycle for the vehicles while driving uphill, but also the auxiliary braking can be fully utilized by the engine while driving downhill.