A　scientific　and　reasonable　siting　decision　is　the　key　to　ensure　the　smooth　operation　and　positive　results　of　the　project.　In　this　paper,　a　grey　multi-criteria　decision-making　(MCDM)　method　is　proposed　and　applied　to　the　siting　of　electrochemical　energy　storage　station　(EESS)　projects.　First,　this　paper　constructs　an　criteria　system　consisting　of　5　criteria　and　22　sub-criteria.　Second,　considering　the　uncertainty　and　hesitation　of　decision　makers　(DMs),　grey　numbers　are　used　to　describe　the　evaluation　information　of　DMs,　and　further　decision　information　is　mined　through　secondary　evaluation　based　on　the　initial　evaluation.　Third,　considering　the　unique　situation　of　the　EESS　with　many　criteria,　equal　importance　and　interdependence　among　criteria,　the　improved　best-worst　method　(IBWM)　expands　the　scope　of　application　to　make　the　decision-making　process　more　realistic.　Fourth,　in　order　to　reduce　the　loss　of　information,　the　grey　entropy　method　and　the　probability-based　WISP　method　are　proposed.　Finally,　the　validity　and　feasibility　of　the　method　is　verified　through　case　studies.　The　results　show　that　P2　is　the　optimal　choice.　This　work　has　important　theoretical　significance　and　practical　application　value,　and　provides　a　reference　basis　for　early　decision-making　of　the　EESS　project.