中文摘要：

BL Lac天体表现出很多的特殊观测性质，根据巡天方式的不同它们可以分为射电和X选BL天体，不少的作者讨论过它们的关系，从两个完备的样本中选择有热光度和核主导系数的样本，讨论它们的不同和统一的问题，结果表明两种选择的BL天体在热光度上表现的不同是由喷流造成，也就是说两种天体本质上是一样的。

英文摘要：

BL Lacertae abjects show stone particularly abservational properties. They were classified as radio- selected and X - ray selected BL Lacertae abjects from surveys. Many authars have investigated their relationship. In this paper, we chase two samples from two complete samples of BL Lacertae abjects, compiled the core-dominance parameters and bolometric luminosity, investigated the differenee in thase parameters and the unified scheme. The resuhs indicated that the apparent difference in the luminosity is caused by the relativistic beaming effecl. In this sense, we can say that radio - selected and X- ray selected BL Lacertae objects are originally the same.