A kind of physiology phase pen,Include: a handwriting,System comprising a penholder,One holds a pen portion and a pen core； One measuring temp unit,System's setting what holds a pen portion,To measure one of women user basal body temperature； One processing unit,System's setting what penholder is interior and is electrically connected to measuring temp unit,Processing operation is carried out to obtain one of women user physiology phase period to basal body temperature； One storage element,System's setting what penholder is interior and is electrically connected to processing unit,Basal body temperature is stored with record； And a display unit,The surface of system's setting what penholder is simultaneously electrically connected to processing unit,To show a message.一種生理期筆，包含：一筆體，係包含一筆桿、一握筆部及一筆芯；一溫度量測單元，係設置於握筆部，用以測量一女性使用者之一基礎體溫；一處理單元，係設置於筆桿內並電性連接至溫度量測單元，對基礎體溫進行處理運算以取得女性使用者之一生理期週期；一儲存單元，係設置於筆桿內並電性連接至處理單元，以記錄儲存基礎體溫；以及一顯示單元，係設置於筆桿之表面並電性連接至處理單元，以顯示一訊息。
