Exception handling method for multi-application module client in same process

The invention relates to an exception handling method for a multi-application module client in the same process. The exception handling method comprises the following steps of building functional units; building an application program domain for each functional unit Mi in boarding process P of a system S by the system S; boarding each functional unit in the corresponding application program domain; integrating each application program domain and the corresponding functional unit by the system; boarding the system and the functional units in a single process; carrying out data transfer among different functional units by a data transfer method crossing the application program domains when service relevance exists among different functional units; and downloading the functional unit by the system when the functional unit is abnormal. By the exception handling method, the influence range due to abnormality of the system can be effectively controlled, all functional modules are safely separated, the system safety