Intelligent air conditioning is a branch of intelligent buildings, and especially in the office buildings, the intelligent level is of great significance to save electric energy. Aiming at the remote monitor and control technology of multi-split air conditioning system, this paper presents two remote monitoring schemes:one is the line control scheme, the other is the group control scheme. Both schemes present respectively the implementation of bottom hardware, software protocol and control flow to support connecting to a remote server, monitoring corresponding multi-split air conditioning indoor machine with client. By the comparison tests, the two schemes can realize the remote control of the multi-split air conditioning, and the performance is reliable and stable.