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Sweetpotato is known as a self-incompatibility crop, but some varieties are self-compatible. Expression degree of self- compatibility was investigated with thirty three Korean sweetpotato varieties based on the ratio of seed capsule sets, pollen germination and number of pollen tubes in style from intra- or inter-flower pollination. Most of the investigated varieties were self- incompatible. Five varieties such as ‘Hongmi’, ‘Hwangmi’, ‘Sinjami’, ‘Mokpo 34’ and ‘Shinmi’ expressed high degree of self- compatibility with 6.6~30.3% of pollen germination and the number of pollen tubes per style ranging 1.8~4.3. Some varieties including Wonmi, Seonmi, Borami and Mokpo 32 were also self-compatible, even though the degree of self-compatibility were very low in pollen germinations and pollen tubes. Expression degree of self-compatibility can be effectively investigated by the observation of pollen germination and pollen tubes from intra-flower self pollination.