A compact high-power diode laser system was demonstrated and reported. Weak laser beam of a distributed feedback laser was successfully injected into a tapered chip amplifier, from which more than 700 mW laser power was output and a continuous tuning range of 1 nm was achieved. The laser system has a compact structure and stable laser intensity, and it is convenient to operate. It can be used in laser cooling and trapping of neutral atoms, ultracold quantum gases, quantum information, atomic frequency standards, and relative experiments in space.