The cymbal piezoelectric energy conversion device is set in the sole in this system. Using positive piezoelectric effect, it can convert vibration energy into electric energy when people walking. It exports AC (Alternating Current) voltage. AC voltage is rectified to DC (Direct Current) voltage and steadied to 4.2. The mobile telephone Li charger is charged by DC voltage. The max charge current is 300, and the min charge current is 100 . A Li battery that is discharged to 3.2 can be charged up to 3.6 through 2 hours when a human whose weight is 60is walking with the speed of 23 steps/sec.