Lithium　lubricating　grease　containing　nano-mesoporous　SiO　2　was　prepared　by　using　SiO　2　with　different　morphologies　and　pore　structures　as　additive.　The　effects　of　morphology,　pore　structure　and　mass　concentration　of　nano-mesoporous　SiO　2　on　tribological　properties　and　rheological　properties　of　lithium　grease　were　investigated　by　Anton-paar　NHT3　nano-indentation　tester　and　Anton-paar　MCR302　rotary　rheometer.　The　results　show　that　the　spherical　nano-mesoporous　SiO　2　additive　reduced　the　tribological　coefficient　more　effectively,　strengthened　the　skeleton　stability,　enhanced　the　thixotropy,　anti-shear　ability　and　thermostability　of　greases.　Under　low　and　moderate　shear　rate,　the　rheological　experimental　data　was　fitted,　and　a　new　grease　rheological　model　was　proposed,　containing　nanoparticals　mass　concentrations　parameter.　©　2018,　Science　Press.　All　right　reserved.