Method and system for dynamic instance deployment of public cloud

According to one exemplary embodiment, a method for dynamic instance deployment of public cloud, uses a load monitor to obtain a current configuration at least including identity information of each of a plurality of servers, and a number of current connections, a server level and a located area of each of the plurality of servers; and uses a scaling engine to determine whether there is at least one server of the plurality of servers satisfies at least one trigger condition, add the at least one server that satisfies the at least one trigger condition into a server candidate set, and receive a performance ratio information to perform a server scaling procedure according to the server candidate set.