In　this　paper,　based　on　the　method　of　gas　kinetic　theory,　the　formulas　for　the　drag　force　of　the　spherical　particle　moving　in　the　near-wall　region　are　obtained　in　the　free　molecular　regime　respectively.　The　results　show　that　there　is　no　near-wall　effect　when　the　gas-wall　reflection　is　specular.　When　the　particle　moves　parallel　to　the　planar　wall　with　diffuse　scatterings,　the　force　on　the　particle　in　the　direction　parallel　to　the　planar　wall　is　the　drag　force　and　in　the　direction　perpendicular　to　the　planar　wall　is　the　near-wall　force.　At　higher　wall　temperatures,　the　particle　is　repelled　by　the　wall　effect,　while　at　lower　wall　temperatures,　the　particle　can　move　towards　close　to　the　wall.　When　the　particle　moves　perpendicular　to　the　wall,　the　force　on　the　near-wall　particle　is　the　resultant　force　of　the　drag　force　and　the　near-wall　force.　©　2025　Science　Press.　All　rights　reserved.