The Partially Fixed Configuration Mapping (PFCM) is a context mapping technique for Dynamically Reconfigurable Processor Array (DRPA) focusing on reducing the power consumption. It assigns operations into Processing Elements (PEs) so as to keep the configuration of the previous context as possible. It reduces the changing part of the datapath structure on the PE array as well as its switching frequency. Preliminary evaluation results show that it can reduce the computing power by 6.7% - 11.3%. The demonstration shows the power reduction directly by using the real chip MuCCRA-3, a prototype of DRPA executing signal processing applications with and without applying PFCM. The design environment for using PFCM is also exhibited.