This invention discloses a construction method and system of a desktop operating system to construct a server side, a compiling host side and an integration host side. The method comprises the following steps: the server side receives a source package and a compiling instruction, allocates a server host as the compiling host side for source packages according to load balancing condition of the compiling host side, and sends a compiling task; the compiling host side receives the compiling task and creates a temporary compiling environment according to the compiling dependent condition of the source package so as to compile the source package; when the source package is compiled, the server side sends an integrating instruction; the integration host side receives the integrating instruction to create a temporary integrating environment; and the desktop operating system is integrated under the temporary integrating environment. The construction method and system automatically compile and construct the desktop operating system to replace manual operation, and solve the problems of low compiling efficiency, low product quality, poor compatibility, and the like, caused by manual compiler construction of the desktop operating system.