Abstract: In multiple blade row environment, neighboring blade rows interaction can significantly affect the aeroelastic stability and forced response of a blade row. A two dimensional semi actuator disk model of forced response and three dimensional semi actuator disk model of flutter in multiple blade row environment have been developed and used to investigate the above effect in this paper. Analyses shown that the blade row interaction effect is influenced by the characteristics of disturbance propagation and relative axial position of the blade row. By applying energy method to flutter analysis, it is shown that the effect of neighboring blade rows interaction is destabilizing, but, blade row aeroelastic stability can also be enhanced by properly adjusting the blade row relative axial position. To the problem of forced response induced by the wake of the neighboring blade row, the aeroelastic character of a blade row is mainly determined by gust response. To subresonant modes, potential gust response which plays a major role relative to vortical gust response is strengthened rapidly as blade row spacing is reduced, therefore, blade row spacing should not be designed to be less than a “safe” value, which is determined by blade aerodynamic load, flow angle, rotor speed and blade number ratio of neighboring blade rows, in order to avoid inducing too strong gust load and forced response.