针对主星是细长型小行星，而次星是小而规则天体的双小行星系统，采用偶极子—粒子模型，建立了普适性的引力场模型，研究了系统平衡点附近的局部动力学及周期轨道问题。研究了同步状态下系统参数对平衡点位置、稳定性和变化趋势的影响，并给出了非共线平衡点的线性稳定域，计算了在非同步双小行星系统的等效平衡点的轨迹。结合路径搜索修正法和伪弧长延拓方法得到同步双小行星系统共线平衡点附近的1∶1共振轨道族。该研究能为双小行星系统探测中轨道设计问题提供理论基础。“,”The local dynamics and periodic orbits in the vicinity of equilibrium points in binary asteroid systems are investigated. The dynamical model for synchronous binary asteroid system with one elongated asteroid and one small and regular asteroid is established. For the synchronous binary system, the influences of system parameters on location, stability, and variation trends of the equilibrium points are studied. The linear stability area for non-collinear equilibrium points is given. For the non-synchronous binary system, trajectories of equivalent equilibrium points are found. 1∶1 families of resonant orbits near the collinear equilibrium points of the synchronous binary asteroid system are obtained by the path searching correction method and the pseudo-arclength continuation method. This study can provide theoretical basis for the orbital design in binary asteroid explorations.