Abstract:The slope stab ility is a very impo rtan t p rob lem in rock and so il engineering. The ex ist ing m ethods of slope stab ility analysis have differen t defau lt s, som e are very comp licated, som e are too simp lif ied. A n imp roved R igid Body L im it Equ ilib rium M ethod——B lock Elem en t M ethod is app lied to analyze slope stab ility. The m ethod has the advan tages of R igid Body L im it Equ ilib rium M ethod and F in ite Elem en t M ethod. In th is m ethod, the w ho le equ ilib rium condit ion s are kep t, and the defo rm at ion of m aterial is con sidered to som e ex ten t. Examp les show that it is a sen sib le and effect ive m ethod of slope stab ility analysis.