Various kinds of organic polymers were studied for the optimum organic binders on metal injection molding. Polyacetal(POM) is a degradation type polymer, and the rate of degradation is faster than that of other polymers. However, POM is eluted from the mixture of polyolefin polymers (polyethylene and polypropylene) and paraffin wax in the molten state. During thermal debinding process, the brown parts made of the feedstocks containing POM had cracks at high debinding speed, but the brown parts made of the feedstocks containing polyacetal polyethylene polymer-alloy polymer (POM/PE) had no cracks and no pores . During thermal debinding process, the degree of distortion of the test pieces with the feedstocks containing POM/PE was smaller than that of the test pieces with the feedstocks containing polyolefin polymer . The carbon content of sintered parts was less than 100ppm, and the relative density of sintered parts was 96%.