  By means of the data sets from the Pan-STARRAS1 survey, we have
systematically examined the relationship between the variability
characteristics and the physical parameters of the largest NLS1 galaxy sample
up to now. The results are summarized as follows: (1). We find significant
anti-correlations between variability amplitude and absolute magnitude in g, r,
i, z and y bands, which are consistent with the results in previous works. (2)
The correlations between the variability amplitude in optical band and many
physical parameters (e.g., {\lambda}L(5100 {\AA}), black hole mass, Eddington
ratio, R4570 and R5007) are investigated. The results show the variability
amplitude is significantly anti-correlated with L(5100 {\AA}), MBH, Eddington
ratio and R4570, but positively correlated with R5007. The relation could be
explained by the simple standard accretion disk model. (3) We further
investigate the relationship between optical variability and radio
luminosity/radio-loudness. The results present weak positive correlation in g
and r bands, but insignificant correlation in i, z and y bands. The large error
of the approximate fraction of the host galaxy in i, z and y bands may lead to
insignificant correlations.
