The quantum-Well heterostructure (QWH) laser is one of the new-type semiconductor lasers developed during the last decade. The main characteristics is the thickness of the source range is so small (<500) that the quantum size effects are exhibited. The linearity of its intensity-current characteristics, the stability of the threshold current and noise characteristics-dynamical behaviors-are better than those of the typical double heterostructure (DH) lasers. In this paper, the main features and properties of QWH lasers are briefly described and studied.