The invention discloses an on-chip and off-chip data object static assignment method. The existing method is complicated and has low data calling efficiency. The method comprises the following steps: firstly determining the storage structure of a target processor system; secondly according to an application program, using a compiler to perform static analysis to the data object of the program andobtain data objects to be distributed and the size of the occupied space; then setting the parameters of a simulator corresponding to the on-chip memory and the off-chip memory, starting a simulator performance statistical tool, preparing to perform the simulation of the data storage and access performance of the program; finally distributing the data objects, wherein all the data objects are distributed to the off-chip memory; and counting the time of the cache miss per word (CMPW) of each data object to be distributed and the descending order of the data objects to be distributed. By using the invention, the data storage and access time of the program can be reduced and the energy consumption of data storage and access can be lowered, thus improving the overall performance of the embedded system.