diff --git a/_server/data.comment.js b/_server/data.comment.js
index fc527ef8..ba4af04e 100644
--- a/_server/data.comment.js
+++ b/_server/data.comment.js
@@ -555,13 +555,7 @@ var data_comment_c456ea59_6018_45ef_8bcc_211a24c627dc =
                     "_leaf": true,
                     "_type": "checkbox",
                     "_bool": "bool",
-                    "_data": "是否循环计算临界；如果此项为true则使用循环法（而不是回合数计算法）来算临界"
-                },
-                "loopStep": {
-                    "_leaf": true,
-                    "_type": "textbox",
-                    "_range": "thiseval==null || thiseval>0",
-                    "_data": "循环计算临界时，每次攻击增加量为原始攻击的多少分之一。\n例如，5000就代表循环中每次攻击增加量是原始攻击的1/5000（向上取整）。\n默认值5000。"
+                    "_data": "是否循环计算临界；如果此项为true则使用循环法（而不是回合数计算法）来算临界\n从V2.5.3开始，对于大数据的循环法将改为使用二分法进行计算"
                 },
                 "startUsingCanvas": {
                     "_leaf": true,
diff --git a/libs/enemys.js b/libs/enemys.js
index cc3ca193..e7e26535 100644
--- a/libs/enemys.js
+++ b/libs/enemys.js
@@ -210,16 +210,45 @@ enemys.prototype.nextCriticals = function (enemy, number, x, y, floorId) {
         }
     }
     else { // 暴力for循环法
+
+        // V2.5.3以后，大数据改为二分法进行计算
+        var LOOP_MAX_VALUE = 1;
         pre = info.damage;
-        var per_add = Math.ceil(hero_atk / (core.flags.loopStep||5000));
-        if (per_add<0) per_add = 1;
-        for (var atk=hero_atk+per_add;atk<=mon_hp+mon_def;atk+=per_add) {
-            var nextInfo = this.getDamageInfo(enemy, core.status.hero.hp, atk, core.status.hero.def, core.status.hero.mdef, x, y, floorId);
-            if (nextInfo==null) break;
-            if (pre>nextInfo.damage) {
-                pre = nextInfo.damage;
-                list.push([atk-hero_atk, Math.floor(info.damage-nextInfo.damage)]);
-                if (nextInfo.damage<=0 && !core.flags.enableNegativeDamage) break;
+        if (hero_atk <= LOOP_MAX_VALUE) { // 循环法
+            for (var atk=hero_atk+1;atk<=mon_hp+mon_def;atk++) {
+                var nextInfo = this.getDamageInfo(enemy, core.status.hero.hp, atk, core.status.hero.def, core.status.hero.mdef, x, y, floorId);
+                if (nextInfo==null) break;
+                if (pre>nextInfo.damage) {
+                    pre = nextInfo.damage;
+                    list.push([atk-hero_atk, info.damage-nextInfo.damage]);
+                    if (nextInfo.damage<=0 && !core.flags.enableNegativeDamage) break;
+                    if (list.length>=number) break;
+                }
+            }
+        }
+        else { // 二分法算临界
+            var calNext = function (currAtk, maxAtk) {
+                var start = Math.floor(currAtk), end = Math.floor(maxAtk);
+                if (start>end) return null;
+
+                while (start<end) {
+                    var mid = Math.floor((start+end)/2);
+                    var nextInfo = core.enemys.getDamageInfo(enemy, core.status.hero.hp, mid, core.status.hero.def, core.status.hero.mdef, x, y, floorId);
+                    if (nextInfo == null) return null;
+                    if (pre>nextInfo.damage) end = mid;
+                    else start = mid+1;
+                }
+                var nextInfo = core.enemys.getDamageInfo(enemy, core.status.hero.hp, start, core.status.hero.def, core.status.hero.mdef, x, y, floorId);
+                return nextInfo==null||nextInfo.damage>=pre?null:[start,nextInfo.damage];
+            }
+            var currAtk = hero_atk;
+            while (true) {
+                var next = calNext(currAtk+1, mon_hp+mon_def, pre);
+                if (next == null) break;
+                currAtk = next[0];
+                pre = next[1];
+                list.push([currAtk-hero_atk, info.damage-pre]);
+                if (pre<=0 && !core.flags.enableNegativeDamage) break;
                 if (list.length>=number) break;
             }
         }
diff --git a/project/data.js b/project/data.js
index 080a41f7..969c0da9 100644
--- a/project/data.js
+++ b/project/data.js
@@ -382,7 +382,6 @@ var data_a1e2fb4a_e986_4524_b0da_9b7ba7c0874d =
 		"hatredDecrease": true,
 		"betweenAttackCeil": false,
 		"useLoop": false,
-		"loopStep": 5000,
 		"startUsingCanvas": false,
 		"startDirectly": false,
 		"statusCanvas": false,
diff --git a/project/functions.js b/project/functions.js
index 13f525d0..373900ea 100644
--- a/project/functions.js
+++ b/project/functions.js
@@ -632,14 +632,14 @@ var functions_d6ad677b_427a_4623_b50f_a445a3b0ef8a =
 		damage=Math.max(0, damage);
 
 	return {
-		"mon_hp": mon_hp,
-		"mon_atk": mon_atk,
-		"mon_def": mon_def,
-		"init_damage": init_damage,
-		"per_damage": per_damage,
-		"hero_per_damage": hero_per_damage,
-		"turn": turn,
-		"damage": damage
+		"mon_hp": Math.floor(mon_hp),
+		"mon_atk": Math.floor(mon_atk),
+		"mon_def": Math.floor(mon_def),
+		"init_damage": Math.floor(init_damage),
+		"per_damage": Math.floor(per_damage),
+		"hero_per_damage": Math.floor(hero_per_damage),
+		"turn": Math.floor(turn),
+		"damage": Math.floor(damage)
 	};
 },
         "updateEnemys": function () {