This study was carried out to determine the contamination level of heavy mentals in canned fishes on the market. Contents of tin, lead, iron and zinc were analyzed by Atomic Absorption Spectrophtometer. Contents of total mercury were determined by mercury analyzer. The results were as follows. 1. The highest value of tin was $1.7706{pm}0.3216$pprn in canned yellow pin & skip jack(mix) tuna, the lowest was 1.2109 ${pm}$ 0.0769ppm in canned mackerel pike. 2. The highest value of lead was 0.1657 ${pm}$ 0.0530 pprn in canned yellow pin tuna, the lowest was 0.0335k 0.0100 pprn in canned mackerel pike. 3. The highest value of iron and zinc was 22.5943 ${pm}$ 0.7945 ppm and 13.4556 ${pm}$ 0.6774 pprn in canned sardine fish, the lowest was 4.3514 ${pm}$ 0.3607 pprn and 3.8773 ${pm}$ 0.1914 pprn in canned albacore tuna. 4. The total mercury contents was detected 0.0531~0.3386 pprn in three kinds of canned tuna and could not be detected with the others.