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主序星在可顯示恆星演化過程的赫羅圖上，是分佈在由左上角至右下角，被稱為主序帶上的恆星。
赫羅圖可顯示恆星的演化過程，大約90%的恆星位於赫羅圖左上角至右下角的帶狀上，這邊線稱為主序帶。位於主序帶上的恆星為主序星。形成恆星的分子雲是位於圖中極右的區域，但隨著分子雲開始收縮，其溫度開始上升，慢慢移至主序。恆星臨終時會離開主序，除質量極低的恆星會往左下方移動，大質量恆星會往右上方移動，這裡是紅巨星及紅超巨星的區域，都是表面溫度低而光度高的恆星。未經過超新星爆炸的恆星會移向左下方，這裡是表面溫度低而光度高的區域，是白矮星的所在區域，接著會因為能量的損失，漸漸變暗成為黑矮星。
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