A field experiment was conducted for two years to investigate the effect of biochar amendment on the yield and quality of potato and to provide a scientific basis for biochar application in potato productivity, there were three treatments in terms of biochar amendment rates of 0, 20 and 40 t/hm², termed as C0, C20 and C40, respectively, and each treatment was replicated four times. The yield and quality of potato and soil properties were analyzed. The results showed potato yield under C20 increased by 41.08% compared with the CK (C0), and the increase in proportion of large-size potato contribution to the total yield increased by 51.24%. However, potato yield was not affected by biochar amendment under C40, whereas potato quality decreased. The dry matter and starch content of potato decreased by 18.47% and 24.03% respectively under C40 in 2016. Biochar amendment increased soil pH, the contents of organic carbon, available phosphorus and potassium significantly, C/N ration and soil conductivity. The above results proved that the effects of biochar on soil pH and total N content depended on experimental duration, the responses of potato yield and quality to biochar amendment were influenced by biochar application rate and experimental duration, biochar amendment could significantly increase potato yield at low application rate, whereas had no effect on potato yield but decreased potato quality under high application rate. No direct evidence was found between potato yield change with soil compaction improvement by biochar application.