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Motivating by the discovery of association between GW 170817 and sGRB170817A, we present a comprehensive analysis for sGRBs observed with Fermi/GBMin 9 operation years and study the properties of sGRB 170817A -like events. Wederive a catalog of 275 typical sGRBs and 48 sGRB 170817A-like weak events fromthe GBM data of 2217 GRBs. We visibly identify two patterns of their lightcurve, single episode (Pattern I, 61\% of the SGRBs) and multiple episodes(Pattern II, 39\% of the SGRBs). Their duration distribution shows a tentativebimodal feature. Their spectra can be fitted with a cutoff power-law model,except for 4 sGRBs, and the spectral indices normally distribute at$\Gamma=0.69\pm 0.40$. Their $E_p$ values show a tentative bimodal distributionwith peaks at 145 keV and 500 keV. No correlation among $T_{90}$, $E_p$, and$\Gamma$ is found. GRB 170817A is a soft, weak sGRB with $ E_{p}=124\pm 106$keV, $L_{\rm iso}=(5.67\pm4.65)\times10^{46}\rm ~erg~s^{-1}$, and $E_{\rmiso}=(3.23\pm2.65)\times10^{46}\rm ~erg$. It follows the $E_{\rm iso}-E_{\rmp}$ relation of typical short GRBs. Its lightcurve is of Pattern II. Twolightcurve patterns, together with the potential two components in the $E_{\rmp}$ and $T_{90}$ distributions, we suspect that the current sample may includetwo distinct types of sGRBs from different progenitors. sGRB 170817A-likeevents may be from NS-NS mergers and those sGRBs with a Pattern I lightcurvemay be from another distinct type of compact binary.

{\em Fermi}/GBM Short Gamma-ray Burst Catalog and Case Study for GRB 170817A/GW 170817