diff --git a/index.html b/index.html
index 5da6808..bc07ef5 100644
--- a/index.html
+++ b/index.html
@@ -233,7 +233,7 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
     $('#statusLabel').innerText = status ? status.charAt(0).toUpperCase() + status.slice(1).toLowerCase() : '';
 
     switch (status) {
-        case 'IDLE':
+        case 'BUSY':
             continue;
         case 'READY':
             $('#begin > span.text').innerText = 'Begin';
diff --git a/main.py b/main.py
index 1ad8716..ff18145 100644
--- a/main.py
+++ b/main.py
@@ -42,7 +42,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
     sp = ServiceProvider.default()
 
     class Status(Enum):
-        IDLE = 0
+        BUSY = 0
         READY = 1
         RUNNING = 2
         STANDBY = 3
@@ -64,7 +64,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
     t1 = Timer()
     t2 = Timer()
     options = dict()
-    status = Status.IDLE
+    status = Status.BUSY
 
     def begin(opts: dict, args: dict):
         nonlocal status
@@ -141,23 +141,26 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
     class ProductInfo:
         def __init__(self, file):
             self.wb = openpyxl.load_workbook(file, read_only=True)
-            self.headers = list()
+            self.indices = dict()
+            self.headers = dict()
+
+        def index(self, *keys: str):
+            self.indices.clear()
+            self.headers.clear()
 
             for col in range(1, self.wb.active.max_column + 1):
                 value = str(self.wb.active.cell(1, col).value)
-                self.headers.append(value)
-
-        def search(self, by: str, needle) -> dict:
-            a = self.headers.index(by)
-            b = None
+                if value in keys: self.headers[value] = col
 
             for row in range(1, self.wb.active.max_row + 1):
-                if self.wb.active.cell(row, a+1).value == needle:
-                    b = row
-                    break
+                for key in keys:
+                    col = self.headers[key]
+                    value = str(self.wb.active.cell(row, col).value)
+                    self.indices.setdefault(key, dict())[value] = row
 
-            if b is None: return dict()
-            return { k: self.wb.active.cell(b, c+1).value for c, k in enumerate(self.headers) }
+        def at(self, by: str, index) -> dict:
+            if (a := self.indices.get(by)) is None or (b := dict.get(a, index)) is None: return dict()
+            return { k: self.wb.active.cell(b, c).value for k, c in self.headers.items() }
 
     try:
         logger.info('Downloading product list...')
@@ -183,6 +186,8 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
         p = ProductInfo(file)
         driver.close()
         driver.switch_to.window(driver.window_handles[0])
+        logger.info('Indexing product information...')
+        p.index('产品编号', '产品名称', '产品型号')
         logger.info('Done')
         status = Status.READY
     except Exception as e:
@@ -416,7 +421,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
                     match kind:
                         case 'vat':
                             record[8] = product
-                            record[9] = (p.search('产品型号', code) or p.search('产品名称', product)).get('产品编号')
+                            record[9] = (p.at('产品型号', code) or p.at('产品名称', product)).get('产品编号')
                             record[10] = code
                             record[11] = '%.2f' % price
                             record[12] = '%g%%' % discount
@@ -424,7 +429,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
                             record[14] = '%g' % quantity
                             record[15] = description
                         case 'correction':
-                            record[8] = p.search('产品编号', profile.remise).get('产品名称')
+                            record[8] = p.at('产品编号', profile.remise).get('产品名称')
                             record[9] = profile.remise
                             record[13] = '0'
                             record[14] = '0'