In order to solve the slagging problems of the stalks-based biomass pellet fuel, through adding four kinds of additives into corn stalks, the experimental research of the slagging percentage, ash melting and fuel characteristics, together with the validation tests were conducted in this paper. The results showed that 3% of MgCO3, CaCO3 and Al2O3 could change slagging effectively, among which MgCO3 had the best effects, the slagging rate was approximately zero; CaCO3 could result in the highest efficiency in anti-slagging. The slagging rate was less than 10%. Adding additives had no apparent influence on the fuel combustion characteristics. The results can provide a basis for solving the slagging problems of the corn stalks-based solid fuel.