執行緒優先順序由執行緒所屬程序的優先順序類、執行緒自身的相對優先級別共同確定，二者組合值作為執行緒的基優先順序。（base priority level）
win32系統中，執行緒基優先順序的範圍從最低優先順序0到最高優先順序31。
系統優先順序程式優先順序類別
執行緒優先順序等級
1idle_priority_class
thread_priority_idle
1below_normal_priority_class
thread_priority_idle
1normal_priority_class
thread_priority_idle
1above_normal_priority_class
thread_priority_idle
1high_priority_class
thread_priority_idle
2idle_priority_class
thread_priority_lowest
3idle_priority_class
thread_priority_below_normal
4idle_priority_class
thread_priority_normal
4below_normal_priority_class
thread_priority_lowest
5idle_priority_class
thread_priority_above_normal
5below_normal_priority_class
thread_priority_below_normal
5background normal_priority_class
thread_priority_lowest
6idle_priority_class
thread_priority_highest
6below_normal_priority_class
thread_priority_normal
6background normal_priority_class
thread_priority_below_normal
7below_normal_priority_class
thread_priority_above_normal
7background normal_priority_class
thread_priority_normal
7foreground normal_priority_class
thread_priority_lowest
8below_normal_priority_class
thread_priority_highest
8normal_priority_class
thread_priority_above_normal
8foreground normal_priority_class
thread_priority_below_normal
8above_normal_priority_class
thread_priority_lowest
9normal_priority_class
thread_priority_highest
9foreground normal_priority_class
thread_priority_normal
9above_normal_priority_class
thread_priority_below_normal
10foreground normal_priority_class
thread_priority_above_normal
10above_normal_priority_class
thread_priority_normal
11foreground normal_priority_class
thread_priority_highest
11above_normal_priority_class
thread_priority_above_normal
11high_priority_class
thread_priority_lowest
12above_normal_priority_class
thread_priority_highest
12high_priority_class
thread_priority_below_normal
13high_priority_class
thread_priority_normal
14high_priority_class
thread_priority_above_normal
15high_priority_class
thread_priority_highest
15high_priority_class
thread_priority_time_critical
15idle_priority_class
thread_priority_time_critical
15below_normal_priority_class
thread_priority_time_critical
15normal_priority_class
thread_priority_time_critical
15above_normal_priority_class
thread_priority_time_critical
16realtime_priority_class
thread_priority_idle
17realtime_priority_class
-718
realtime_priority_class
-619
realtime_priority_class
-520
realtime_priority_class
-421
realtime_priority_class
-322
realtime_priority_class
thread_priority_lowest
23realtime_priority_class
thread_priority_below_normal
24realtime_priority_class
thread_priority_normal
25realtime_priority_class
thread_priority_above_normal
26realtime_priority_class
thread_priority_highest
27realtime_priority_class328
realtime_priority_class429
realtime_priority_class530
realtime_priority_class631
realtime_priority_class
thread_priority_time_critical
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