Abstract: Some thoroughly research on load state detection in SMSC entity is introduced in this paper. Load detection parameters and model are presented after analyzing the relationship between inter resource and load state in the system. Moreover, a novel strategy to detect system load state based on fusion of multi detection data is presented. By some test, the theory and method are proved most feasible. Our research show that load state of SMSC can be recognized by detecting utility of internal resource utilizing, and multi redundant detecting data fusion is effective approach to improve the reliability and trust degree of the result.