The decaking technology with co-pyrolysis of caking coal and non-caking coal was brought out to destroy the caking property of caking coal. And the properties of decaking and co-pyrolysis of caking coal with the decaking technology were studied with co-pyrolysis experiments using TG-MS and fixed bed pyrolyzer. It could be seen from TG-MS experiments that the caking property of the mixed coal produced by caking coal and non-caking coal was smaller than that of caking coal. And pyrolysis of caking coal can be improved by the addition of non-caking coal. The co-pyrolysis characteristics of the mixed coal were the combined action of those of the two single coals. And it could be seen from the fixed-bed pyrolysis experiment that the decline of caking property of the mixed coal rised with smaller particle size of coal and the descent of the ratio of caking coal to non-caking coal in the mixed coal (XX:XF). And the agglomerate was slight. With the descent of XX:XF, the content of char reduced in pyrolysis products, but the contents of tar, coal gas and carbon deposition and water were higher. With the descent of XX:XF, the fractions of distillation cut <170℃ and 230~300℃ in tar from mixed coal first rise and then decrease and reach peak value at XX:XF=6:4~3:7, and the fractions of distillation cut of 170~210℃, 210~230℃, 300~360℃ rised, while the fraction of distillation cut >360℃ decreased. With the descent of XX:XF, the contents of H2, CO and CO2 in coal gas from mixed coal become larger, but the contents of CH4 and C2~C3 became smaller. While the contents of H2+CO+CH4 became first smaller and then larger with XX:XF and reached peak value at XX:XF=5:5~3:7. And with the descent of XX:XF, the char from mixed coal had smaller C/N and C/H, larger amplitudes of increase of C content and reduction of content of N and H, larger special surface area, more and larger internal pore structure, lower ignition temperature, more complete combustion.