弱混合角是标准模型的一个基本参数，通过精确测量弱混合角，与其它基本参数一起可以严格检验标准模型。目前精度最高的两个测量值来自电子对撞机，相互偏离超过3倍标准偏差，亟待利用大型强子对撞机开展新的高精度测量。而LHCb探测器因为其独特的前向几何接收度和良好的缪子探测能力，其数据相比LHC上的其它探测器对弱混合角具有更高的灵敏度。LHCb弱混合角测量对大型强子对撞机LHC时代的电弱物理具有重要意义。.计划利用LHCb探测器在2015-2018年所采集的数据，对Z->mumu事例进行重建与分析，基于Z玻色子的前后不对称性来测量弱混合角。通过精确的缪子能量刻度、采用新方法研究部分子分布函数误差等措施，尽管统计量相对较低，预期仍能达到与LHC其它实验相似的测量精度，并为探测器升级后更深入研究奠定基础。此外，我们还将测量Z玻色子的角度参数，这些参数可以用来检验量子色动力学，并检验胶子自旋。

The weak mixing angle is one of fundamental parameters in the Standard Model (SM). Precision measurement of the weak mixing angle, together with other SM fundamental parameters, could provide stringent test on the SM. Currently, the two most precise measurements come from electron colliders, which are differ by more than 3 standard deviations. Therefore, it is very important to measure the weak mixing angle at LHC. The LHCb detector is a single-arm forward detector, with unique detector acceptance and good muon identification, which has better sensitivity to the weak mixing angle. With these advantages, it is very important to perform the weak mixing angle measurement at LHCb...We are planning to use the collision data that collected with LHCb detector in year 2015 – 2018. The reconstructed Z->mumu events will be used to perform these analyses. The weak mixing angle will be measured by using the Z boson forward-backward asymmetry. Although the collected data sample is smaller than other experiments at LHC, the expected precision is close to the results from other experiments in the hadron colliders. We will also investigate the potential improvements for this measurement, which is aiming to the future measurement after LHCb detector upgrade. Besides that, we will also measure the Z angular coefficient, as these parameters can be used to test the QCD theory, also could test the gluon spin.