Abstract: Taking product's feature as core, a modeling procedure is proposed to develop virtual assembly systems with an algorithm given to check interference. By this procedure the solution to sequential assembly scheme can be simplified using a hierarchical assembly model to store all the interactions among parts in a matrix. The algorithm is used to compute effectively relative distance between any parts to be assembled in any direction, i.e., the equivalent interference, and then analyze the assembly possibility of all non-geometric information provided by the modeling procedure. The simulation consists of assembly simulation and kinematics simulation, where the former is performed and monitored interactively using the sequential assembly scheme created by the hierarchical assembly model. The parameterized kinematics simulation enables the users to understand fully the kinematical properties of the machine in assembly and find out the problems in relation to kinematics for convenient design correction.