The present disclosure relates to the field of computers, and in particular to the field of cloud services. Provided are a method and system for installing an application on a cloudphone, and a client cloudphone. The specific implementation solution comprises: receiving a trial request for a target application; reading installation data of the target application from a network storage service cluster, wherein the installation data is generated after a master cloudphone decompresses an installation package of the target application and installs same, and the installation data is written into the network storage service cluster by the master cloudphone; copying the installation data to a local installation directory; and locally registering the target application. By means of the embodiment, the time of a user that is consumed in waiting for installation and the traffic data consumption of downloading an installation package of an application can be reduced, thereby achieving the aim of immediate trialling of the application.