In the field of oil prospecting, mineral exploration and geological structure research, the gravity method is a commonly used method. The application range of the gravity method mainly depends on the gravimeter. High-precision gravimeter plays an important role in the application and population of the gravity methods. In this paper, the authors present the investigation of a high-precision transportable cold atom gravimeter, which is expected to be used in the field applications. The improved magnetic coils are used in the gravimeter instead of the expensive mu-metal for magnetic shielding. Besides, a portable platform of relatively small size is applied to the vibration isolation. The total interrogation time is optimized to 120 ms and the repetition rate is 2.2 Hz. A sensitivity of and a resolution of within 1000 s integration time have been reached. The continuous measurement of g over 128 hours is carried out. Moreover, a whole seismic wave of about 1 hour that occurred in Pakistan on September 28, 2013 was recorded by the atomic gravimeter. The result coincides well with that recorded by a traditional seismic detector.