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In order to examine the exogenous situation of heavy metals in tobacco growing areas of Zunyi City, irrigation water samples(n=572) and organic fertilizer samples(n=21) were collected from the main tobacco growing areas. The concentration of As, Cd, Cr and Pb were investigated and compared with the national standards. The results showed that the concentration of As, Cd, Cr and Pb in the irrigation water were 0~71%, 0~2.9%, 0~6.6% and 0~8.5% of the national standard respectively. The concentration of As, Cd, Cr and Pb in fertilizers were 3.87%~64.1%, 2.33%~74.7%, 6.53%~38.1% and 10.9%~59.2% of the national standard respectively. The concentration of heavy metals in irrigation water and organic fertilizer in the main tobacco growing areas of Zunyi City is at the safe level. [ABSTRACT FROM AUTHOR]