在一般情形下,主债权已过诉讼时效,则其效力及于从权利。主债权的诉讼时效届满后而利息债权的诉讼时效尚未届满者,宜视为同主债权诉讼时效的届满而届满。保证债务人在主债务的诉讼时效届满后亦享有时效抗辩权。主债权的诉讼时效届满后,则抵押人享有时效抗辩权,且抵押权在抵押人行使时效抗辩权后消灭。然而,主债权的诉讼时效届满并不影响质权、留置权的行使。 Under normal circumstances, the main claim has passed the limitation of action, then its effectiveness and rights. After the expiration of the limitation of action of the principal claim and the limitation of action of the interest claim has not expired, it shall be deemed as expiration of the limitation period of the principal claim. The debtor also has the right of defense after the expiration of the legal liability of the principal debt. After the expiration of the legal claims, the mortgagor shall have the right of defense, and the mortgaga will be extinguished after the mortgagor exercises the right of defense. However, the expiration of the litigation limitation of the principal claim does not affect the exercise of the pledge and lien.