Abstract: Based on analysis of the equations and numerical discretization of POP ocean model，discuss the local blocking technique and load-balance data distribution，focusing on their influence upon parallel performance on quad-core cluster.Aggregation optimization is adopted for the communication bottleneck.Research and experiment show that local blocking technique and way of data distribution have remarkable effect on performance，and the aggregation optimization is effective on quad-core cluster，especially for the case of load-balance data distribution.