In order to precisely control the temperature and current of distributed feedback lasers, the drive device of distributed feedback laser was designed by using digital signal processing chip.The device was used to set the reference voltage of the current and the temperature of the laser. After digital-to-analog conversion, through the temperature and current driving module, the reference voltage and the temperature were fed into the distributed feedback laser. And then, the device was used to drive distributed feedback lasers and experiments were carried out to verify the results. The results show that, within 40min, the temperature variation range and the standard difference are no more than 5mK and 0.7mK, respectively. The current variation range and the standard deviation are not more than 40μA and 6μA. When driving the semiconductor optical amplifier, the turn-off time is less than 1μs. The device has good instantaneous response characteristics and high temperature and current stability. The flow control module has good transient characteristics and can precisely control the temperature and current of distributed feedback lasers. The control device can be used to study optical cavity ring-down spectroscopy. It can controll distributed feedback lasers and drive the optical amplifiers to turn off the lasers.