Mobile devices and smart terminal represented by ipad, iphone and the android phones have made a significant development in recent years. The number of their users is growing explosively. In order to meet the requirments of timeliness of accesses of information, power consumption, as well as the network environment in practical application, we should replace the traditional pull way with the push way to deliver messages. MQTT(Message Queuing Telemetry Transport) is a messaging protocol just designed for the situation. This paper describes the basic content and features of the MQTT protocol.Meanwhile it designs and realizes a message pushing server based on the MQTT protocol in foundation of several open source projects such as Mosquitto and Redis.The server can push messages to the users who have subscribed them before.In the meantime, some more functions such as user identity authentication, ACL permission checking, topic automatic subscribing, hot topic stastics and server status monitoring are added.