diff --git a/基本结构/状态机/81A.py b/基本结构/状态机/81A.py
new file mode 100644
index 0000000..c7c726b
--- /dev/null
+++ b/基本结构/状态机/81A.py
@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+import cppy.cp_util as util
+from collections import Counter
+
+
+class WordFrequencyStateMachine:
+    def __init__(self, file_path):
+        self.file_path = file_path
+        self.content = None
+        self.words = None
+        self.word_freq = None
+        self.state = 'IDLE'
+
+    def transition_to_read_file(self):
+        try:
+            with open(self.file_path, 'r', encoding='utf-8') as file:
+                self.content = file.read()
+                self.state = 'WORDS_SPLIT'
+        except FileNotFoundError:
+            print(f"文件 {self.file_path} 未找到。")
+        except Exception as e:
+            print(f"读取文件时发生错误: {e}")
+
+    def transition_to_split_words(self):
+        if self.content is not None:
+            self.words = util.extract_str_words(self.content)
+            self.state = 'CALCULATE_FREQ'
+        else:
+            print("文件内容为空，无法分割单词。")
+
+    def transition_to_calculate_freq(self):
+        if self.words is not None:
+            self.word_freq = Counter(self.words)
+            self.state = 'DONE'
+        else:
+            print("单词列表为空，无法计算词频。")
+
+    def run(self):
+        while self.state != 'DONE':
+            if self.state == 'IDLE':
+                self.transition_to_read_file()
+            elif self.state == 'WORDS_SPLIT':
+                self.transition_to_split_words()
+            elif self.state == 'CALCULATE_FREQ':
+                self.transition_to_calculate_freq()
+            else:
+                print(f"未知状态: {self.state}")
+                break
+
+        return self.word_freq
+
+    # 使用状态机计算词频
+
+
+state_machine = WordFrequencyStateMachine(util.testfilepath)
+word_frequencies = state_machine.run()
+
+# 打印结果
+for word, freq in word_frequencies.most_common(10):
+    print(f"{word}: {freq}")
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