To grasp the influences of sea and land winds on the atmospheric turbulence characteristics in an offshore complex terrain, an atmospheric turbulence field experiment was implemented at Yangmeikeng Environmental Ecology Center in Shenzhen city. The data involved in atmospheric refractive index structure constant, atmospheric sound virtual temperature, wind profile are obtained by the micro-thermal meter, ultrasonic anemometer and Doppler lidar. By analyzing the effects from sea and land winds on the power spectrum, isotropy, and energy dissipation rate of turbulence, we find that the turbulence in sea winds develops more fully than in land winds. In the sea winds, the frequency range of isotropic coefficients close or equal to 1 spans 0.05-50 Hz, and the speed spectral power law is near -5/3. In land winds, the atmospheric turbulence only shows an isotropy at very small proportion of time at 0.8-10 Hz. The speed spectral power law seriously deviates from -5/3, tends to a high value, and possesses an average value of -1.3. Under the conditions of sea and land winds, the relationship between turbulence energy dissipation rate and turbulence intensity is linear. The fitting slopes of data from the micro-thermal meter are 1.1 and 0.76, and those from the ultrasonic anemometer are 0.73 and 0.28, respectively. The conclusion here can provide some reference for the study on laser transmission in a marine environment.