By using the dual boundary element method （DBEM）, the interaction between two coplanar cracks in a transversely isotropic half space was analyzed under a normal or tangential uniform traction. According to the SIFs calculated by the present method,the influence of free surface on the SIFs was ex- amined firstly. It can be concluded that the free surface exerts an obvious influence on the SIFs of this type of crack subjected to a normal uniform traction. In order to quantitatively describe the influence of the interaction between cracks on the SIFs, the interaction factor was introduced. The variations of the interaction factor were investigated with the crack spacing,the side ratio and the distance from free sur- face. Results show that the crack spacing and side ratio have a significant effect on the interaction factor and the free surface has a little influence on the interaction factor.%基于双横观各向同性材料基本解的对偶边界元方法，分析了半无限横观各向同性材料中两条共面裂纹的相互作用问题。裂纹面上分别作用着法向和切向两种均布荷载，材料的各向同性面及裂纹面平行于半无限域自由面。数值计算得到了该类裂纹的应力强度因子（SIF）值和两条共面裂纹相互作用的SIF值影响系数。根据数值结果分析了自由面对该类裂纹SIF值的影响，以及裂纹间距与形状、自由面对SIF值影响系数的影响。结果表明，自由面对作用法向力时的该类裂纹SIF值有明显的影响，裂纹间距与形状对SIF值影响系数影响较大，但自由面对SIF值影响系数基本无影响。
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