This　paper　investigates　the　coupling　between　mass-diffusion　and　mechanical　quantities　inside　chemo-mechanical　media.　Both　the　mechanical　constitutive　equations　and　the　mass-diffused　constitutive　equations　of　chemo-mechanical　media　are　established.　Combining　these　constitutive　relations　with　the　governing　equations　of　chemo-mechanical　fields,　coupled　finite　element　formulation　is　developed.　The　redistribution　of　mass　caused　by　the　mechanical　loading　and　the　structure　deformation　caused　by　the　chemical　loading　are　analyzed　numerically　in　detail.　The　results　show　that　interaction　between　mechanical　and　chemical　fields　can　be　simulated　by　the　present　finite　element　method.