With aims of improving braking stability and the capability of capturing braking energy of an electric urban bus with parallel regenerative braking strategy，the influence on the reclaiming efficiency of braking energy under the braking stability demand is analyzed. Following ECE R13 and using the positional relation between generalized braking force distribution line and generalized expected braking force distribution curve，the braking intensity of electro-mechanical parallel braking under parallel braking strategy is determined between 0.1 and 0.3 with a consideration on engineering practices of an electric urban bus. Braking force distribution ratio of a mechanical braking system system during electro-mechanical parallel braking is adjusted to maximum within the regulation permissible range by inertia proportional valve. ADVISOR2002 is redeveloped to build a simulation model of a rear-wheel-drive electric vehicle. Simulation results with this strategy show a significant improvement of an electric urban bus braking energy reclaiming performance under the typical urban driving cycles conditions.