低质量X射线双星发现了大量千赫兹准周期振荡（kHz QPO）现象，其有助于探测中子星磁场、引力场等物理性质和双星吸积环境。本课题旨在探索kHz QPO的发射机制、密近双星吸积环境及演化：分析kHz QPO频率与中子星自旋频率的相关性，探索kHz QPO的发射机制，估计其它kHz QPO源的中子星自旋；统计计算kHz QPO最内发射位置，应用其约束中子星半径，探索吸积过程对中子星自旋演化的影响；利用kHz QPO探测atoll/Z源各分支发射位置，分析各分支物理性质及谱态的形成机制；探索SAXJ 1808.4-3658中子星最小稳定圆轨道半径、kHz QPO发射半径、密近双星共转半径间关系，分析其吸积环境及中子星周期-磁场演化过程。我们将结合观测统计和理论分析，以kHz QPO为探针，探索低质量X射线双星的吸积环境及演化，为将来进一步观测提供理论参考。

Low mass X-ray binaries have discovered many kilohertz quasi-periodic oscillation (kHz QPO) phenomena, which are helpful to probe the magnetic field, the gravitational field and other physical properties of the neutron stars, and to probe the accretion environment of the binaries. The proposal aims to explore the emission mechanism of kHz QPOs, the accretion environment and the evolution of the close binaries: analyze the correlation between the frequencies of the kHz QPOs and the neutron star spins, then explore the emission mechanism of kHz QPOs, and estimate the neutron star spins of other kHz QPO sources; collect and calculate the innermost emission positions of the kHz QPOs, and apply them to constrain the neutron star radii, then explore how the accretion process affects the spin evolution of the neutron stars; probe the emission positions of the different branches of atoll/Z sources by kHz QPOs, and analyze the physical properties of the different branches and the formation mechanism of the spectrum states; explore the relation between the innermost steady circular orbit radius, the emission radii of the kHz QPOs and the co-rotate radius of the close binary of SAXJ 1808.4-3658, and analyze its accretion environment and the period-magnetic field evolution process. We will combine the observational statistics with the theoretical analysis, and take the kHz QPOs as the tool to explore the accretion environment and evolution of the low mass X-ray binaries, and provide the theoretical reference for the further observations.