Smoothed particle hydrodynamics (SPH) is a new meshless method and is gradually developed to the field of landslide analysis due to its advantages in large deformation simulation. However

flow rule and dilatancy angle has an important influence on the motion characteristics of slope after failure

but the analysis of their influence on large deformation slope is rarely reported. In this paper

the procedure of SPH based on elastic-plastic constitutive and D-P yield criterions was implemented in Fortran. Then

through two typical examples

the influence of flow rules and dilatancy angle on landslide analysis were discussed by using associated flow rule and non-associated flow rule (? =0 and ? =1/2? respectively). The results show that: excessive expansion will be produced when using associate flow rule and non-associated flow rule with ? =1/2?

both cases above are not in conformity with the actual situation. However

the non-associated flow rule with ? =0 can obtain the satisfactory result when calculating non-expansive soil

but will cause smaller speed and sliding distance when simulating expansive soil. Non-associated flow rule with appropriate consideration of expansion (? =(0.1～0.2)?) is suggested when calculating post-failure behavior of expansive soil and could obtain satisfactory results.