没问题了 谢谢大家的回复。换来一个板子就行了，可能是板子坏了。以下是详细的程序！简单明了！
TIM1 PWM的详细用法。
[TIM1 的 CH1 = PA.8和CH1N = PB.13]
Step1, 定义初始化结构体
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
Step2, 使能外设时钟 TIM1 GPIOA GPIOB
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
Step3, 初始化一会儿用到的GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_Init(GPIOB, &GPIO_InitStructure);
Step4, 重设为缺省值
TIM_DeInit(TIM1); //重设为缺省值
Step5, TIM1时钟配置
TIM_TimeBaseStructure.TIM_Prescaler = 4000; //预分频(时钟分频)72M/4000=18K
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseStructure.TIM_Period = 144;//装载值 18k/144=125hz 就是说向上加的144便满
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置了时钟分割 不懂得不管
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期计数器值 不懂得不管
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);
Step6, Channel 1 Configuration in PWM mode
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 PA8
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道也有效 PB13
TIM_OCInitStructure.TIM_Pulse = 40; //占空时间44 中有40的时间为高，互补的输出相反
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空闲状态下的非工作状态
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管
TIM_OC1Init(TIM1,&TIM_OCInitStructure);
Step7, TIM1 counter enable开定时器
TIM_Cmd(TIM1,ENABLE);
Step8, TIM1 Main Output Enable 使能TIM1外设的主输出 必须的别忘了
TIM_CtrlPWMOutputs(TIM1,ENABLE);
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