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Root-knot nematode (Meloidogyne spp., RKN) is one of the most economically important plant parasitic nematodes with wide host including potato (Solanum tuberosum). In order to investigate resistance of potato to the northern RKN, M. hapla, twenty-eight main potato cultivars and breeding materials in Heilongjiang province with a pot experiment was conducted in greenhouse by randomized block design with five replications. M. hapla could be propagated on all materials with a reproduction factor ranging from 1.53 to 37.90. The reproduction factors of cultivars Baitouweng (2.41), Hui-2 (2.02), and Hongshen (1.53) were significantly different (P < 0.05) from those of Qingshu 3 (36.93) and 608 Kennebec (37.90). The egg mass number per gram fresh root ranged from 26.6 (Baitouweng) to 217.4 (Kexin 13). Cultivar Baitouweng was resistant one according to egg mass scale. The galling index ranged from 1.5 to 6.8. Three cultivars including Baitouweng (1.8), Hui-2 (1.5), and Hongshen (2.2) were identified as resistance resources based on galling index (GI). Overall, Baitouweng was confirmed as resistant cultivar, Hui-2 and Hongshen as tolerant ones to root-knot nematode, and the cultivars Qingshu 3 and 608 Kennebec as susceptible control. [ABSTRACT FROM AUTHOR]