本质上，你想覆盖__init__方法，models.Model以便保留原始值的副本。这样一来，你就不必进行其他数据库查找（这总是一件好事）。
class Person(models.Model):
name = models.CharField()
__original_name = None
def __init__(self, *args, **kwargs):
super(Person, self).__init__(*args, **kwargs)
self.__original_name = self.name
def save(self, force_insert=False, force_update=False, *args, **kwargs):
if self.name != self.__original_name:
# name changed - do something here
super(Person, self).save(force_insert, force_update, *args, **kwargs)
self.__original_name = self.name
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