According to the trend of CPU hybrid architecture for future development in the highperformance computing area, this paper introduces the tuning case of some core segments in the BCC_AGCM model in the Sunway TaihuLight High Performance Computer System. It uses the core segment called quad for example. Through fixing the structure of codes and using OpenACC to instruct the way to execute the program, this segment is transplanted successfully to the platform; the speedingup is realized; and the results passed verification. This case shows that using the OpenACC with little changes in the program can get a speed up. The effectiveness for improving efficiency of the core segment in hybrid architecture is due to the structure of codes, the granularity of cycle parallelism, and address continuity.