本文主要在微观层面上分析了再保险研究中一个突出的问题：再保险最优化。
This paper primarily focuses on one issue in the field of reinsurance research: reinsurance optimization.
第四章讨论了夏普比率下的再保险最优化模型及其适用条件，推出了更一般的模型。
Chapter 4 discusses reinsurance optimization model under sharpe's ratio and the conditions applicable, it derives more general model.
第二章讨论了均值方差原理下的再保险最优化模型及其适用条件，针对停止损失再保险，得出个体模型与集合模型下的最优结论。
Chapter 2 discusses reinsurance optimization model under mean-variance principle. Aiming at change stop loss reinsurance, it derives optimal conclusions of both individual model and collective model.
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