In the field of the control system, MP or Multiple operating systems is often used, which will encounter the communication problems of process control operations in heterogeneous platforms, because different platforms handle data format is different. This paper proposes a cross-platform communication model. The model uses the method of intermediate proxy, which separates the underlying communication and the upper application and makes the underlying communication process transparent to the user. Based on the CMS and NML of RCS library, according to the model, the paper presents the corresponding implementation methods. CMS is the underlying communication management system of RCS library, providing the functions of reading and writing messages, encoding/decoding data and cross-platform communication. NML is the encapsulation of CMS, providing a higher level interface to make the upper system communication more convenient and to solve the communication between the heterogeneous platforms better. The CMS/NML are realized by a series of C++ classes.