The invention discloses a method and a system for heterogeneous memory allocation based on data object hot degree. The method comprises; performing instrumentation in source codes, counting reading-writing operation information of data objects included in the source codes; through performing cache filtering on the reading-writing operation information of the object, obtaining memory access characteristics of the data object, the memory access characteristics of the data object being characteristic of variation of reading-writing operation memory access frequency of the data object on heterogeneous memory with time; according to the memory access characteristics of the data object, determining memory access hot degree grade of the data object; according to the memory access hot degree grade of the data object, at least a piece of information of time delay energy consumption information and available capacity information of a dynamic random access memory, and time delay energy consumption information and available capacity information of a nonvolatile memory, distributing the data object to one of the dynamic random access memory and the nonvolatile memory. In the method, an object is used as a minimum granularity, resource waste on memory bandwidth can be reduced, and availability of the memory is considered, and performance of the system is ensured.