In order to work out the optimum parameters of carbon-containing pellets made from low-grade limonite,with the coal slime as the reducing agent,and with the drop strength of wet balls and compressive strength of dry ball as evaluating criteria,effects of dosage of coal slime,particle size of raw ores,water requirement,pellet pressure and bentonite consumption on strength of carbon-containing pellets are explored. The results show that the pellet strength is somewhat different due to different kind of coal slime,cold bonded carbon-containing pellets with drop strength of wet ball as 7.3 times/P and compressive strength of dry ball as 197.6 N/P can be obtained under the conditions of coal slime B addition 25%,particle size of -0.074mm raw ores accounting for 76%,water requirement 4%,pellet pressure 10 MPa and bentonite consumption 4%. High ash content and high viscosity of coal slime are favorable for improving the strength of cold bonded pellets,and the recycling of waste coal slime as reductant can reduce pollution of environment and improve economic efficiency.