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Noise environment in Japan is becoming worse because of dense population and automobiles, of high speed trains, of industrial facilities located close by or within populated area and of wooden houses which is sensitive to outdoor noise. Based on the noise pollution regulation law of Japan, the allowable noise level varies according to the types of zone. The authors performed technical assessment of noise environment, and made up a total environmental noise propagation analysis using many data and theoretical analysis. The system can be applied to any kind of noise environment assessment. They obtained results on industry noise, traffic noise, and construction noise. The characteristics of the system is as follows; the system can deal with all problems of noise, the program can be chosen in accordance with objectives of assessment, large scaled data are based on knowhows, input data are formated and common jobs are concentrated, general output is given by figure of noise contour and special output by tables of octave band sound pressure level at the receiving point.