Abstract: The main weak point of BP algorithm is that the optimal procedure is easilly trapped into local minimum value and the speed of convergence is very slow.A kind of improvement BP neurel network algorithm is proposed in the paper.The classical non-linear functions is improved by introducing a parameter，after that the improved algorithm is applied into the practical teaching evaluation；Carrided on the comparison with the other values，it indicates that the improved algorithm has the very good effect in the aspects of the speed of convergence and error evaluation.In the end，the logical evaluated teaching effect is reasonably proved by the selecting appropriate value of the parameter based on the results analysis of the real data.

摘要： 经典的BP算法存在陷入局部极小，算法收敛慢的问题。提出了一种改进的BP神经网络算法，在经典BP算法基础上，引入新的参数以调整经典的神经元转换函数，然后把改进算法应用到实际的教学评估中；利用真实数据的分析结果选取了参数的适当值。结果表明，改进后的算法在收敛速率和误差估计等方面有很好的效果，并实现了对教学效果的合理评价。