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Based on linear thermoacoustic theory, an open-air traveling-wave thermoacoustic generator with 1 bar air has been designed and built up. The dimensions of regenerator and resonator influence on the resonant frequency, driver ratio, acoustic power and temperature difference are simulated and optimized to acquire the perfect performance, respectively. According to above simulated results, the acoustic pressures at the open end and 0.5 m far away from the open end of the resonator versus the heating power are investigated experimentally. The improved maximum acoustic pressures are up to 133 dB and 101 dB ref 20 μPa, respectively. [ABSTRACT FROM AUTHOR]