Abstract: The present disclosure relates to a routing switch apparatus, a network switch system, and a routing switch method. The routing switch apparatus includes one or more direct memory access modules and at least two protocol conversion interfaces. The direct memory access module is configured to generate a continuous access request of a cross network node, and control data transmission in the at least two protocol conversion interfaces; each protocol conversion interface is configured to convert a communication protocol of data transmitted inside and outside the routing switch apparatus and connect the routing switch module and an external network node. The routing switch apparatus may be introduced to replace a network switch, so that cross-node memory access and IO space access can be performed directly rather than through a proxy, thereby reducing delay of the cross-node memory access and IO space access and improving overall performance of a system.