SCC98D was screened from an activationtagging mutant library in the background of blue lightreceptor cryptochrome double mutant cry1cry2 in Arabidopsis, which was early flowering, short hypocotyl and excess petal number, and then the phenotype of late flowering and long hypocotyl in cry1cry2 was suppressed. The flanking sequence of inserted site was cloned with TAILPCR. The sequenced result of flanking sequence has shown that the TDNA was inserted in 1751 bp of 18srRNA. Afterwards, a transcriptional analysis of the gene around inserted site with RTPCR demonstrated that the activated gene was 18srRNA. This study has identified that 18srRNA is involved in Crymediated signaling.