diff --git a/src/actions/HeroAction.lua b/src/actions/HeroAction.lua
index 1afd164..5ba8167 100644
--- a/src/actions/HeroAction.lua
+++ b/src/actions/HeroAction.lua
@@ -865,6 +865,11 @@ function _M.drawHeroRpc(agent, data)
 
 	local unitPool = csvdb["build_unitCsv"][poolId]
 	if not unitPool then return 7 end
+    -- ssr硬性保底
+    local isSSRup = false
+    if unitPool["rare_"..HeroQuality.SSR] or 0 > 0 then
+        isSSRup = true
+    end
 
 	-- 开始抽
 	local resultPool = {}
@@ -872,21 +877,38 @@ function _M.drawHeroRpc(agent, data)
 		local condition = {"rare"}
 		local values = {}
 
+        -- check ssr up
+        if isSSRup then
+            local ssrUpMap = role:getProperty("ssrUp") or {}
+            local ssrFloorCnt = ssrUpMap[poolId] or 0
+            if ssrFloorCnt >= (globalCsv.draw_ssr_guarantee or 40) - 1 then
+                values[1] = HeroQuality.SSR
+                ssrUpMap[poolId] = 0
+            else
+                for idx, field in ipairs(condition) do
+                    if not values[idx] then
+                        local lpool = {}
+                        local curIdx = 1
+                        while unitPool[field .. "_" .. curIdx] do
+                            lpool[curIdx] = {unitPool[field .. "_" .. curIdx]}
+                            curIdx = curIdx + 1
+                        end
+
+                        if next(lpool) then
+                            values[idx] =  math.randWeight(lpool, 1)
+                        end
+                    end
+                end
+                if values[1] == HeroQuality.SSR then
+                    ssrUpMap[poolId] = 0
+                else
+                    ssrUpMap[poolId] = ssrFloorCnt + 1
+                end
+            end
+            role:updateProperty({field="ssrUp", value = ssrUpMap, notNotify = true})
+        end
 
-		for idx, field in ipairs(condition) do
-			if not values[idx] then
-				local lpool = {}
-				local curIdx = 1
-				while unitPool[field .. "_" .. curIdx] do
-					lpool[curIdx] = {unitPool[field .. "_" .. curIdx]}
-					curIdx = curIdx + 1
-				end
 
-				if next(lpool) then
-					values[idx] =  math.randWeight(lpool, 1)
-				end
-			end
-		end
 
 		local weight = 0
 		local up_pool = nil
--
libgit2 0.21.2