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In order to reduce the speed fluctuation and the wear of brakes, the asymmetric deviation characteristics of hydro-mechanical transmission （HMT） full power shift timing suitable for engineering applications are studied based on the full power shift method. A two-range arithmetic HMT is taken as the research object. The prior stable stage models of full power shift are established based on the full power shift method, including the hydraulic transmission model and brakes torque model during two brakes overlapping. The influences of advance and lag of shift timing on brake sliding process and prior stable stage are studied by theoretical analysis and experimental study. In the full power shift, the speed of fixed displacement hydraulic component can be lower than the ideal speed during the power shift from H range to HM range, and the negative deviation of ideal shift speed should be set. During the power shifting from HM range to H range, the speed of fixed displacement hydraulic component can be higher than the ideal speed, and the positive deviation of ideal shift speed should be set. The results reveal the influence of shift timing on the performance of prior stable stage. [ABSTRACT FROM AUTHOR]