Sample analyzer and control method of sample analyzer

The embodiment of the invention provides a sample analyzer and a control method thereof, and the method comprises the steps: obtaining the capacitance change of a liquid suction needle in a process that a driving assembly drives the liquid suction needle to move downwards into a container containing a sample, converting the capacitance change into an electric signal, and determining the position information of the liquid suction needle; whether the liquid state in the pipeline is abnormal or not is judged according to the position information of the liquid suction needle and the electric signal caused by capacitance change on the liquid suction needle. Therefore, the liquid level false detection phenomenon caused by abnormal liquid state in the pipeline can be effectively avoided, and the liquid absorption success rate is increased while the liquid level detection accuracy is improved. 本申请实施例提供了一种样本分析仪和样本分析仪的控制方法，通过在驱动组件驱动吸液针向装有样本的容器中下移过程中，获取所述吸液针上的电容变化，将该电容变化转换为电信号，并确定所述吸液针的位置信息；实现根据吸液针的位置信息和吸液针上由电容变化引起的电信号，