The two-dimensional electron gas (2DEG) residing at complex oxide interfaces has been drawing considerable interests due to its abundant physical characteristics. Moreover, it exhibits a response towards diverse external stimuli and a correlation among different freedoms, like spin, lattice, orbital charge, etc. The most studied objects are SrTiO₃ (STO) and KTaO₃ (KTO)-based heterointerfaces (HIs), which fully utilize their $d$-orbital characteristics. On the other hand, other oxides may also have enough potential to host 2DEG. Here, an investigation has been done for those oxide-based 2DEGs. Five series of oxides are investigated, including stannate oxide, niobate oxide, scandate oxide, germanate oxide and some simple oxides. Most existing works of such novel oxide substrates rely on theoretical prediction severely, while experimentally achieving them still needs much effort. On the other hand, some so-called substrates need to be grown on other solid substrates first. However, proper surface treatment would be a useful way to overcome the difficulties and develop the potential of such novel oxide substrates. These probable series of oxide-conducting HIs will not only be a great breakthrough for the $d$-orbital-based oxide 2DEG systems but may also hold diverse novel physical phenomena, thus pointing out the route for further development of research and fabrication on oxide electronic devices. Hence, we believe a review of the existing works will be meaningful for stepping across the threshold toward the new era of all-oxide electronics.

复杂氧化物界面上的二维电子气（2DEG）由于其丰富的物理特性而引起了人们的广泛关注。此外，它表现出对各种外部刺激的响应以及不同自由度之间的相关性，如自旋、晶格、轨道电荷等。研究最多的对象是基于SrTiO ₃ (STO)和KTaO ₃ (KTO)的异质界面(HIs)，从而充分利用他们的$d$-轨道特征。另一方面，其他氧化物也可能有足够的潜力来承载 2DEG。在这里，我们对那些基于氧化物的 2DEG 进行了研究。研究了五个系列的氧化物，包括锡酸盐氧化物、铌酸盐氧化物、钪酸盐氧化物、锗酸盐氧化物和一些简单氧化物。大多数此类新型氧化物基底的现有工作严重依赖于理论预测，而实验上实现它们仍然需要付出很大的努力。另一方面，一些所谓的基底需要首先在其他固体基底上生长。然而，适当的表面处理将是克服困难并开发此类新型氧化物基材潜力的有效方法。这些可能的氧化物导电HI系列不仅将是一个重大突破$d$基于轨道的氧化物二维电子气系统，但也可能具有多种新颖的物理现象，从而为氧化物电子器件的研究和制造的进一步发展指明了道路。因此，我们相信对现有工作的回顾对于跨过全氧化物电子新时代的门槛将是有意义的。