diff --git a/hwe/sammo/Command/che_기술연구.php b/hwe/sammo/Command/che_기술연구.php
new file mode 100644
index 00000000..e134cabb
--- /dev/null
+++ b/hwe/sammo/Command/che_기술연구.php
@@ -0,0 +1,145 @@
+<?php
+namespace sammo\Command;
+
+use \sammo\{
+    DB, Util, JosaUtil,
+    General, 
+    ActionLogger,
+    getGeneralLeadership,getGeneralPower,getGeneralIntel,
+    getDomesticExpLevelBonus,
+    CriticalRatioDomestic, CriticalScore, TechLimit,
+    uniqueItemEx
+};
+
+use \sammo\Constraint\Constraint;
+use function sammo\CriticalScore;
+use function sammo\uniqueItemEx;
+use function sammo\getGeneralLeadership;
+
+
+class che_기술연구 extends BaseCommand{
+    static $statKey = 'intel';
+    static $actionKey = '기술';
+    static $actionName = '기술 연구';
+
+    protected function init(){
+
+        $general = $this->generalObj;
+
+        $this->setCity();
+        $this->setNation();
+        
+        $develCost = $this->env['develcost'];
+        $reqGold = $general->onCalcDomestic(static::$actionKey, 'cost', $reqGold);
+
+        $this->constraints=[
+            ['NoNeutral'], 
+            ['NoWanderingNation'],
+            ['OccupiedCity'],
+            ['SuppliedCity'],
+            ['ReqGeneralGold', $reqGold]
+        ];
+
+        $this->reqGold = $reqGold;
+    }
+
+    protected function calcBaseScore():float{
+        $general = $this->generalObj;
+
+        if(static::$statKey == 'intel'){
+            $score = getGeneralIntel($general->getRaw(), true, true, true, false);
+        }
+        else{
+            throw new \sammo\MustNotBeReachedException();
+        }
+        
+        $trust = Util::valueFit($this->city['trust'], 50);
+        $score *= $trust / 100;
+        $score *= getDomesticExpLevelBonus($general['explevel']);
+        $score *= Util::randRange(0.8, 1.2);
+        $score = $general->onCalcDomestic(static::$actionKey, 'score', $score);
+
+        return $score;
+    }
+
+    public function run():bool{
+        if(!$this->isAvailable()){
+            throw new \RuntimeException('불가능한 커맨드를 강제로 실행 시도');
+        }
+
+        $db = DB::db();
+
+        $general = $this->generalObj;
+
+        $trust = Util::valueFit($this->city['trust'], 50);
+
+        $score = Util::valueFit($this->calcBaseScore(), 1);
+
+        ['succ'=>$successRatio, 'fail'=>$failRatio] = CriticalRatioDomestic($general->getRaw(), static::$statKey);
+        if($trust < 80){
+            $successRatio *= $trust / 80;
+        }
+        $successRatio = $general->onCalcDomestic(static::$cityKey, 'succ', $successRatio);
+        $failRatio = $general->onCalcDomestic(static::$cityKey, 'fail', $failRatio);
+
+        $successRatio = Util::valueFit($successRatio, 0, 1);
+        $failRatio = Util::valueFit($failRatio, 0, 1 - $successRatio);
+        $normalRatio = 1 - $failRatio - $successRatio;
+
+        $pick = Util::choiceRandomUsingWeight([
+            'fail'=>$failRatio, 
+            'succ'=>$successRatio, 
+            'normal'=>$normalRatio
+        ]);
+
+        $logger = $general->getLogger();
+
+        $date = substr($general->getVar('turntime'),11,5);
+
+        $josaUl = JosaUtil::pick(static::$actionName, '을');
+        if($pick == 'fail'){
+            $score = CriticalScore($score, 1);
+            $logger->pushGeneralActionLog(static::$actionName."{$josaUl} <span class='ev_failed'>실패</span>하여 <C>$score</> 상승했습니다. <1>$date</>");
+        }
+        else if($pick == 'succ'){
+            $score = CriticalScore($score, 1);
+            $logger->pushGeneralActionLog(static::$actionName."{$josaUl} <S>성공</>하여 <C>$score</> 상승했습니다. <1>$date</>");
+        }
+        else{
+            $score = Util::round($score);
+            $logger->pushGeneralActionLog(static::$actionName."{$josaUl} 하여 <C>$score</> 상승했습니다. <1>$date</>");
+        }
+
+        $exp = $score * 0.7;
+        $ded = $score * 1.0;
+
+        $exp = $general->onPreGeneralStatUpdate($general, 'experience', $exp);
+        $ded = $general->onPreGeneralStatUpdate($general, 'dedication', $ded);
+
+        if(TechLimit($this->env['startyear'], $this->env['year'], $this->nation['tech'])){
+            $score /= 4;
+        }
+
+        $genCount = Util::valueFit(
+            $db->queryFirstField('SELECT count(*) FROM general WHERE nation=%i', $general->getVar('nation')),
+            GameConst::$initialNationGenLimit
+        );
+
+        $nationUpdated = [
+            'tech' => $this->nation['tech'] + $score/$genCount
+        ];
+        $db->update('nation', $nationUpdated, 'nation=%i', $general->getVar('nation'));
+
+        $general->increaseVarWithLimit('gold', -$this->reqGold, 0);
+        $general->increaseVar('experience', $exp);
+        $general->increaseVar('dedication', $ded);
+        $general->increaseVar(static::$statKey.'2', 1);
+        $general->updateVar('resturn', 'SUCCESS');
+        $general->applyDB($db);
+
+        $this->checkStatChange();
+        uniqueItemEx($general->getVar('no'), $logger);
+    }
+
+    
+}
\ No newline at end of file
diff --git a/hwe/sammo/Command/che_상업투자.php b/hwe/sammo/Command/che_상업투자.php
index 3adcdee9..34b2a252 100644
--- a/hwe/sammo/Command/che_상업투자.php
+++ b/hwe/sammo/Command/che_상업투자.php
@@ -8,7 +8,7 @@ use \sammo\{
     getGeneralLeadership,getGeneralPower,getGeneralIntel,
     getDomesticExpLevelBonus,
     CriticalRatioDomestic, CriticalScore,
-    checkAbilityEx
+    uniqueItemEx
 };
 
 use \sammo\Constraint\Constraint;
@@ -46,6 +46,7 @@ class che_상업투자 extends BaseCommand{
     }
 
     protected function calcBaseScore():float{
+        $trust = Util::valueFit($this->city['trust'], 50);
         $general = $this->generalObj;
 
         if(static::$statKey == 'intel'){
@@ -80,9 +81,12 @@ class che_상업투자 extends BaseCommand{
 
         $trust = Util::valueFit($this->city['trust'], 50);
 
-        $score = $this->calcBaseScore();
+        $score = Util::valueFit($this->calcBaseScore(), 1);
 
         ['succ'=>$successRatio, 'fail'=>$failRatio] = CriticalRatioDomestic($general->getRaw(), static::$statKey);
+        if($trust < 80){
+            $successRatio *= $trust / 80;
+        }
         $successRatio = $general->onCalcDomestic(static::$cityKey, 'succ', $successRatio);
         $failRatio = $general->onCalcDomestic(static::$cityKey, 'fail', $failRatio);
 
@@ -128,6 +132,7 @@ class che_상업투자 extends BaseCommand{
                 $this->city[static::$cityKey.'2']
             )
         ];
+        $db->update('city', $cityUpdated, 'city=%i', $general->getVar('city'));
 
         $general->increaseVarWithLimit('gold', -$this->reqGold, 0);
         $general->increaseVar('experience', $exp);