A research has been conducted on the dynamic properties of Holling-II fractional order prey predator system with density constraints and shelters, followed by an inquiry into the existence, uniqueness, non-negativity and boundedness of the system solution with the qualitative analysis method adopted, as well as an analysis of the conditions for the existence of equilibrium points and the local asymptotic stability of various equilibrium points, with the validity of the relevant conclusions verified by a numerical simulation.