Introduction to the Results: The acoustic characteristics of a performance hall are its most fundamental functional attributes. During the mid-stage of the construction of the performance hall, by evaluating the acoustic parameters, more reasonable improvement plans can be obtained, thereby achieving better acoustic characteristics. At the same time, it is also an important task to evaluate the acoustic parameters when the hall is full (seated with an audience). However, both during the mid-stage of construction and during the full-capacity use phase, the evaluation work is difficult to carry out at low signal-to-noise ratios (SNR). In response to this, we have developed a measurement system that can still obtain accurate acoustic parameter measurements at lower SNR levels (20dB). This system integrates advanced noise suppression and denoising technologies, features full-band multi-channel simultaneous measurement, high test efficiency, and high precision of test data. It can also display sound energy attenuation curves for each frequency band, providing testers with a strong basis for judging the validity of measurement data. To ensure scientific and effective measurement work. Technical indicators: 1. Precise measurement results can be obtained when the signal-to-noise ratio (SNR) is below the minimum requirement of relevant standards (35dB) by 15dB. 2. Full frequency band measurements are performed simultaneously, resulting in high test efficiency. 3. Supports simultaneous multi-channel measurements and wireless sensor measurements. 4. Integrates pulse response method, improved sliding window method, and nonlinear law, allowing for different noise environments to select different de-noising methods, thus making the measurement results more accurate. Application fields include the design and sound quality evaluation of performance halls, as well as architectural acoustics experimental research.