天相屬水，象徵玉壐，為天府星系的第五星。
天相傳統意義為皇帝的玉壐，代皇帝執行指令，由於只是個印章，沒有既定性格和意見，具有謹慎、忠誠的特性。由於受人使喚，沒有特定性格，也可以想像成裝著玉壐的盒子，當然容量與巨門不能相比。
天相謹慎的邏輯是這樣的：天相受巨門和天梁所夾，兩者皆具有監察意味，巨門為暗矅，代表朋友喜蓋過其光芒，給予意見，天梁的父母宮喜出於關懷，對天相作出批評，於是天相在緊密監視底下，只能小心謹慎行事。若以天機相比，天機身邊的人多主見，而非給予意見，所以天機只能在其環境中求存和滿足別人，而天相周圍雖然多監察的力量，但仍留有讓其行事的空間，所以天相的重點是謹慎，還有執行。天相的福德宮為競爭上進的七殺，代表內心仍有強悍的想法，加上對宮為破軍，兩者均甚具動感，因此天相受監察而小心，也受有執行的動力，結合起來是按規矩地執行。天相的財帛宮是天府，代表具有保守的價值觀，希望循規蹈矩，為人恭謹平和。
天相是皇帝的印章，為朝中的執行力量，天府是王府，為地方的支持力量，於是又有逢府看相的說法。天相具有恭謹的外觀，但又有著七殺作為其福德宮，心心蠢蠢欲動；天府也代表保守，但又以進取的貪狼為福德宮，形成含蓄地擴張的情況。兩者性質相似，又永恒處於三合關係，結合兩者，可反映命主內心在工作的穩定程度。
天相性點是保守地執行，如果配上火星，就代表不易在一個職位上待很久。由於火星主速，刺激保守的天相，就不能安穩長期地工作。古人喜歡穩定，因此對天相火星的配搭不太推崇，但現代節奏急速，科技發展一日千里，或者更需要多點靈活的頭腦。天相配火星，其本義是不能長期在一個職位工作，吉凶不能一概而論。
天相既然受規矩指導行事方針，便不喜歡單見對星。天相只會照一對星的單星，代表其原則容易受一邊的影響，欠缺公允，可能被收買，偏幫一方面的利益。
由於天相守規矩的特性，會照文昌文曲也有利讀書運。天相也象徵盒子，也有容納的空間，因此也代表學習時的容量。會照文昌文曲，代表能一板一眼地學習知識和技藝，如果巨門會文昌文曲為具有文學藝術的知識修養，這時巨門換上天相，也可以作相似推論，不過這些知識的來源，大多來只傳統名校，通過正規的教育取得，可以說看出有沒有讀名校命。
天相會照地空地劫的話，由於空劫代表清除清空，天相按規矩地學習「清空」，可引伸為對佛教有興趣或更有悟性，可為了了解空性，潛心修行學習。如果同時會照華蓋、天巫等代表宗教和聰慧的副星，則更為準確。
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