The discrimination of bubble states by dynamic bubble collapse was studied for 5 and 3 &mgr;m bubble films. We obtained bias field margin of 6 Oe for the 5 &mgr;m bubble film (S=1H and S=0), and about 10 Oe for 3 &mgr;m bubble films (S=1H and S= (120)). The discrimination was also tried for 3 &mgr;m bubble YY‐propagation pattern chips, for which we got about 8 Oe of bias field margin. Demonstrated was this collapse discrimination for ’’1111...’’ ’’0000...’’, and ’’1010...’’ bubble patterns utilizing an on‐chip bubble annihilator.