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We present an extensive analysis of the X2.0-class confined flare on 2014October 27 in the great active region AR 12192, observed by the \emph{InterfaceRegion Imaging Spectrograph} and the \emph{Solar Dynamics Observatory}. Theslipping motion of the substructures within the negative-polarity flare ribbon(R1) and continual reconnection-induced flows during the confined flare arefirst presented. The substructures within ribbon R1 were observed to slip inopposite directions at apparent speeds of 10-70 km s$^{-1}$. The slippingmotion exhibited the quasi-periodic pattern with a period of 80-110 s, whichcan be observed since the flare start and throughout the impulsive phase of theflare. Simultaneously quasi-periodic flows moved along a reverse-S shapedfilament, with an average period of about 90 s. The period ofreconnection-induced flows is similar to that of the slippage of ribbonsubstructures, implying the occurrence of quasi-periodic slipping magneticreconnection. The spectral observations showed that the Si {\sc iv} line wasblueshifted by 50-240 km s$^{-1}$ at the location of the flows. During theprocess of the flare, the filament did not show the rise phase and was notassociated with any failed eruption. The flare mainly consisted of two sets ofmagnetic systems, with both of their east ends anchoring in ribbon R1. Wesuggest that the slipping magnetic reconnection between two magnetic systemstriggers the confined flare.

Three-dimensional Magnetic Reconnection Triggering an X-class Confined Flare in Active Region 12192