Floor, or floor support, with an anti-seismic system for the movement of shelves comprising: - at least one shelf including movement means designed to allow the movement of said shelf along at least one direction, - at least one guide defining at least one guide direction along which said shelf can translate, and including: - a support portion arranged along said guide direction and designed to support said movement means along a support surface, and - a constraint portion extending along said guide direction parallel to said support portion so as to create at least one groove extending along said guide direction, - a connector constrained to said shelf and including at least one interference portion configured to be at least partially housed within said groove, - said constraint portion and said interference portion defining, along a plane perpendicular to said guide direction, opposite and mutually linked substantially C-shaped profiles so as to achieve at least two points of mutual contact between said connector and said guide when said system is subjected to seismic shocks, - said portions (30, 31) are laid on said floor, or said floor support, and are mutually distinct and separated on said floor or said floor support, by at least part of said groove placed side by side spaced reciprocally apart along said guide direction defining a reciprocal distance (d) and said system being characterized in that said reciprocal distance (d) can be adjusted according to the size of said shelf in a range of 10 mm to 30 mm - at least one shelf including movement means designed to allow the movement of said shelf along at least one direction, - at least one guide defining at least one guide direction along which said shelf can translate, and including: - a support portion arranged along said guide direction and designed to support said movement means along a support surface, and - a constraint portion extending along said guide direction parallel to said support portion so as to create at least one groove extending along said guide direction, - a support portion arranged along said guide direction and designed to support said movement means along a support surface, and - a constraint portion extending along said guide direction parallel to said support portion so as to create at least one groove extending along said guide direction, - a connector constrained to said shelf and including at least one interference portion configured to be at least partially housed within said groove, - said constraint portion and said interference portion defining, along a plane perpendicular to said guide direction, opposite and mutually linked substantially C-shaped profiles so as to achieve at least two points of mutual contact between said connector and said guide when said system is subjected to seismic shocks, - said portions (30, 31) are laid on said floor, or said floor support, and are mutually distinct and separated on said floor or said floor support, by at least part of said groove placed side by side spaced reciprocally apart along said guide direction defining a reciprocal distance (d) and said system being characterized in that said reciprocal distance (d) can be adjusted according to the size of said shelf in a range of 10 mm to 30 mm