To　investigate　the　seepage　field　of　parallel　four-tube　mountain　tunnels　considering　lining,　the　analytical　solution　of　the　seepage　field　of　parallel　four-tube　mountain　tunnels　is　derived　using　a　comprehensive　image　method　and　the　superposition　principle.　Then,　the　solution　is　degenerated　into　the　seepage　field　analytical　solutions　of　single-,　double-,　and　triple-tube　tunnels　and　compared　with　existing　results.　Moreover,　the　analytical　solutions　are　validated　using　numerical　simulation　results,　and　the　influence　laws　of　tunnel　spacing,　tunnel　relative　dimension,　and　primary　support　parameters　on　water　inflow　and　primary　support　outer　pressure　are　analyzed.　The　results　reveal　the　following:　(1)　The　influence　of　tunnel　spacing　between　adjacent　tunnels　is　more　significant　on　the　seepage　field　of　parallel　four-tube　tunnels,　but　the　influence　can　be　ignored　if　the　tunnel　spacing　is　＞20　times　the　radius　of　the　tubes.　(2)　If　the　diameter　of　one　tube　of　the　tunnel　increases,　its　water　inflow　increases　accordingly,　decreasing　the　water　inflow　in　the　other　three　tubes.　(3)　With　a　decrease　in　the　permeability　coefficient　and　an　increase　in　the　thickness　of　the　primary　support,　the　water　inflow　in　a　tube　gradually　decreases,　the　water　pressure　after　the　primary　supporting　gradually　increases,　and　the　interactions　between　tubes　gradually　weaken.　©　2022,　Editorial　Office　of　Tunnel　Construction.　All　rights　reserved.