Once upper distribution network is failed or power quality does not meet requirements, micro-grid coordinates various micro-generations output by switching to a pre-set control strategy to ensure normal island operation. During island operation, different control strategies affect micro-grid’s supply reliability directly. Through analysis of micro-grid’s two most common control strategies (master-slave and peer-peer), this paper builds micro-grid power model taking into account control strategies and proposes sequential Monte Carlo reliability evaluation method of grid-connected micro-gird through main power grid’s minimal path equivalent and micro-grid breakdown influence matrix under different control strategies. Through evaluating the improved IEEE-RBTS using this method, reliability impact of two control srategies is analyzed. The illustrative example shows that micro-grid can improve the reliability performance of distribution network; and reliability of micro-grid with peer-peer control strategy is higher than micro-grid with master-slave control strategy.