Java language and BP algorithm are used to develop a method to identify the writing characters by using a mouse. The BP learning time is getting shorter by improvement of BP algorithm and proper setting of network parameters. 采用JAVA语言,通过合理设置网络的变量,改进误差逆传播校正方法(BP算法),缩短了BP算法的学习时间,提高算法的运算速度,实现了鼠标书写的非常用字符识别。