Shandong fulun Steel has built the first two-strand slab continuous caster for producing products with different sections. The functions and equipment structure together with the hydraulic and electric control principle of taper dynamic balance technology of the slab continuous caster were presented. The quantitative relationship of pressure reduction on mold broadside, disc spring pre-tightening force and the static pressure of liquid steel in the process of casting was derived. From the application of this technology on October 9, 2013 to November 12, 2013, 41 860 t slab has been cumulatively casted, 14 heats on average were continuously cast for every casting sequence, and the maximum casting speed is 1.4 m/min. In the meantime, no taper change happens and the left and right tapers are always kept in ±0.5 mm. The internal and external qualities of slab are excellent, and actual application effect is satisfactory.