Abstract: With the convertor sludge as raw material and with mixed binding of organic and inorganic binding agent, high quality sludge pellet was prepared by crumby pressing and low temperature calcination. The factors that affect the strength of the pellet were examined. Experimental results show that the strength of pellet increased as the calcination temperature increased and it got its peak value while calcination temperature was about 873 K, While temperature was increased to higher than 873 K, with the volatilization of crystalline water and organic binding agent, the pellet strength decreased. However, as temperature increased further, es-pecially as temperature exceeded 1300K, with the effects of liquid sinter and solid diffusion, the pellet strength increased again. Pattern recognition has been carried out to analyze the parameters affect pellet strength, and optimization region of sludge pellet has been classified. The proper process parameters of sludge pellet have been determined.