Abstract: A multi-stabilized bottom hole assembly in borehole is considered as a continuous beam-column with many supports.It can be divided into several simply-supported beam-columns by separating the sections at each stabilizers.A system of "Equations of three moments" is derived to compute the internal bending moments at stabilizers,the side force on bit and the reactive forces at stabilizers.The borehole axis is taken as a circular arc in a vertical plane.Some numerical results are compared with those qiven by Millheim,based on finite element method.