Significant progress in the investigation of spatiotemporal dynamics electrical activity in plant has been enabled by recently developed electrophysiological techniques. The optical recording using Voltage-Sensitive Dyes(VSD) and Multi-Electrode Array(MEA) are the two techniques with higher spatial-temporal resolution which can observe the electrical activity from large numbers of cells simultaneously by now. In this review, the optical recording is introduced with regard to the measuring principle, the characteristics of VSD, construction of system, signal processing methods and the application in plants. Meanwhile, the intrinsic characteristics of MEA system including system composition, characteristics of electrodes, recording basis and factors involved in signal recording are presented. For the application of MEA system in the plant, there is only one case report for the electrical network activity in plant. In the future, some new scientific discoveries of spatial-temporal feature for electrical signal of plant cells population will be expected by using both advanced techniques.