改进后的遗传算法采用自然数直接编码在个体选择上结合使用常用的最优个体保留策略和轮盘赌法，基于经典0-1背包问题的数学模型基础，构造改进后的遗传算法和适应度评估，减少二进制编码或浮点型编码的复杂性，同时精 简 适 应 度 评 估 的 计 算。-Improved genetic algorithm uses natural number encoded on individual choice combined with the use of commonly used best individual retention policies and roulette method, based on the classic 0-1 knapsack problem mathematical model based on the structure improved genetic algorithm and the fitness evaluation to reduce the coding complexity of the coded binary or floating point, while streamlining the calculation of the fitness evaluation.