A set of primers of LAMP assay (Table 1) was designed using LAMP primer designing software Primer Explorer version 4 according to sequence of the GFM cry1A gene. The primers which included a pair of inner primers (FIP and BIP) and a pair of outer primers (F3 and B3) located on the region from 327 bp to 545 bp of the GFM cry1A gene ( Fig. 1) in the insect-resistant rice or cotton. Primers F3 and B3 at two ends of this region were designed for PCR assay.