This paper investigated variations of monthly dustfall and meterological factors in Shanghai by the combination of statistical method, graphic illustration on the basis of monthly dustfall and corresponding meteorological factors from 1993 to 2003，results show that，monthly distribution of dustfall was higher in the season of spring and summer while lower in winter and autumn due to meteorological reason, it is different from northern city fueling coal in larger quantity. More important，the relationships between dustfall and meteorological reason were explored，it was found that the frequency of southern wind direction and high wind velocity，rainfall or rain days play a significant role in the quantity of monthly dustfall，and that the role of relative humidity and temperature might be negligible. Meanwhile，the contribution mechanism and interpretation of monthly variation were gived in brevity. In the text，we also illustrated that the method，which was a combination of statistic and graph，was a valid visual means to shot light on the relationships between dustfall and meteorological factors.