In the multi-disciplinary design process of complex product, it is hard for designers to obtain designing knowledge timely and accurately which causes the low efficiency of product design. With consideration of the above problem, knowledge navigation method is proposed based on context navigation model (CNM) and knowledge model (KM). CNM describes the matching relationship between designing activity context (AC) and knowledge context (KC), and composes of AC, KC and knowledge context network (KCN). KM describes designing knowledge element (KE), and the matching relationship between KC and KE. Based on these models, procedure of multi-disciplinary knowledge navigation is introduced. Taking the design process of industrial steam turbine rotor flow division section as an instance, the result shows that this procedure, based on CNM and KM, is able to supply designers with proper product knowledge timely and promote the designing efficiency of complex product.