As a prevalent architectural style, microservice architecture overcomes the challenges of monolithic architecture and achieves better quality by implementing small-scale microservice, rather than binding all functions into one monolith. Welldesigned microservice architecture with better quality relies on clear understanding of related quality attributes. However, current understanding of quality attributes in microservice architecture is deficient and not comprehensive. In this study, we aim to construct knowledge of quality attributes in architecture through a Systematic Literature Review (SLR), the exploratory case study and the explanatory survey. By analyzing the influential factors and the corresponding tactics of related quality attributes, our research is aimed at providing a comprehensive guide on quality improvement in microservice architecture.