在空间卫星及地基观测技术飞速发展的推动下，恒星物理正在迈入一个高速发展的黄金时期。但是当涉及到恒星有转动和磁活动等观测现象时，现有的恒星演化理论尚未完全能够清楚地解释。我们面临的重大挑战是如何解决这一困难？中国科学院天文台系统观测设备、CoRoT和Kepler卫星提供的高精度、长时间覆盖率的恒星观测数据，为深入研究小质量恒星的转动演化理论提供强有力的限制。借助于星震学诊断工具，研究恒星内部的角动量损失与演化机制，研究恒星磁活动的机理，完善恒星转动演化模型。精确确定恒星的基本参数，给出恒星的年龄、转动与磁活动之间的关系，进一步加深对恒星发动机原理和活动周起源问题的理解，从而揭示小质量恒星的转动演化与磁活动规律。

We are entering a golden era for stellar physics driven by satellite and telescope observations of unprecedented quality and scope. The telescope observations in Chinese Academy of Sciences, and CoRoT and Kepler missions with ultra-high precision photometry of long and continuous observations, provide a unique dataset in which surface rotation rate and stellar activity of low-mass stars. New data and surveys covering large mass and age ranges have provided a wide parameter space. This new capability has provided improved constraints on stellar theory for rotation and activity. However, the observations do not yet allow a detailed confrontation with the description of the physical properties and the dynamics. Further, a major uncalibrated ingredient that makes stellar evolution models uncertain, is the stellar interior rotation and its evolution during stellar life. A better understanding of stellar rotation is of great importance for our understanding of stellar dynamo in general, and especially the evolution and transport of angular momentum. The issue demands us to improve and develop the angular momentum evolution models. The some important physics will be considered in the stellar modelling, including the characteristics of their rotation, magnetic field, and the property of loss and transport of angular momentum of the stars. New insights on stellar evolution and stellar interiors physics are being made possible by asteroseismology. For low-mass stars, an important aspect of development of the angular momentum evolution models can be used to better understand the detailed mechanism driving stellar magnetic activity, and improve the rotation-age-activity relationship, which would allow us to measure the age of a star by measuring its magnetic activity level and its rotation period in a model-independent way. Another aim is to assess their evolutionary status, derive their basic parameters, and improved understanding of stellar dynamos for low-mass stars.