Six field investigation sites in Meihekou City, Jilin Province, which were also covered by the first national water conservancy survey of China for water erosion survey, were chosen as typical research sites in the study on development of gully erosion and its influencing factors in hilly regions with cultivated slope land in Northeast China, using field investigations coupled with geographical information technology (GIS). As results show, (1) in the six investigation units, 142.9 hm²in total area, 93 erosion gullies were found, making up 5 476 m in length, 3.83 km km^-2 in gully density and 4 575 m³ in gross erosion, and accounting for 61.03% of the total valleys in length and 92.35% of the gross erosion of the region; (2) gully erosion was quite severe in the study region, of which Xiaoyang Township, Hongmei Town, Shuangxing Township and Yizuoying Town fell into the category of “Severe” in gully erosion intensity, with gully density reaching 7.12, 4.63, 5.55 and 4.25 km km^-2 respectively, Niuxinding Town and Hailong Town was sorted into the category of “Strong” and “Moderate”, respectively; (3) slope gradient was a critical factor of the development of gully erosion in cultivated slope land and in significant linear relationship with gully density with correlation coefficient being 0.71 (p<0.05). The greatest gully density appeared on a slope with gradient > 8°; (4) with a slope extending on and on, gully density increased first and then gradually decreased, that is, peaking when a slope varied in the range of 200 ~ 299 m in length, and declining gradually when a slope was longer than 500 m; (5) gully density was quite closely related to the length / width ratio, with correlation coefficient being 0.83 (p<0.05) and it decreased with the length / width ratio increasing.