## 1 Introduction  
Mg alloys are promising structural materials due to their low density, high specific strength and specific stiffness. However, it is difficult to achieve large reduction rates rolling at room temperature, resulting from the densely packed hexagonal structure and the plane texture of the Mg-based alloy. The traditional \"Hot rolling + heat treatment\" method can weaken the texture, refine the grain [1] and realize continuous rolling. Plate convexity and flatness are major metrics to evaluate the quality of the product, which are not only related to the roll geometry parameters, but also closely related to the internal reduction rate and the rolling temperature, especially the strip transverse temperature [2]. Moreover, microstructural homogeneity is also a major factor affecting the homogeneous deformation of wide strip rolling [3]. However, the high thermal conductivity leads to problems of cooling, transverse temperature difference and uneven deformation during the deformation of the Mg foils, which aggravate the texture strength or anisotropy and easily induce edge cracking, surface cracking or fracture [2; 4]. It is generally accepted that special deformation methods should be used to improve the rolling capacity of traditional Mg alloy materials and the deformation uniformity of Mg alloy thin strip, such as asymmetric rolling [5], width-limited rolling [6] and cross variable thickness rolling [7]. However, the industrial application of these methods is quite limited, due to their demanding requirements of facility and complex procedures. Over the past few decades, the electroplastic rolling process has been shown to be an effective plasticization method to not only improve the plasticity of highly brittle Mg alloys by fast temperature rise, but also to obtain fine crystal structures by combining large plastic deformations with on-line electrical pulse processing [8]. The effect of pulse current on the deformation of metal materials mainly has two aspects: on the one hand, it has been proved that there is a pure electroplastic effect (non-thermal effect) which can directly reduce the flow stress of materials [9] and improve their plastic deformation ability [10]. On the one hand, the coupling of non-thermal and Joule thermal effects can promote nucleation and selectively induce recrystallization at specific temperatures and current density values. [PERSON] et al. [11] compared thermoelectric coupling rolling with warm rolling experiment results, and found that pulsed currents can induce dynamic recrystallization at lower temperatures, leading to better product surface quality. At constant values of the rolling temperature, the orientation texture and the twin structure can be improved by adjusting the peak current, and the rolling capacity of the Mg alloy can be further improved [12; 13]. A number of studies showed that pulsed current can effectively improve the poor plasticity of the Mg alloy rolling at room temperature, and there are many technical methods to introduce a pulsed current into the rolling process, such as online heating rolling (O-LHR) and electroplastic rolling. The method of on-line heating rolling is to use a pulsed current to heat the strip before rolling, and rolling it after the target temperature is reached. The O-LHR has the advantages of a high heating rate, uniform transverse temperature and stable rolling temperature compared to traditional hot rolling. By adjusting the temperature and tension of the O-LHR, the surface quality of the strips is significantly improved, and the comprehensive mechanical properties of the rolled strips are excellent for meeting the experimental requirements [14; 15; 16]. Electroplastic rolling, in which a pulsed current is introduced during the rolling process, is characterized by high efficiency for automated production, and EPR is a promising rolling technology for industrial production. However, the experimental objects for electroplastic rolling were mainly narrow strips and filament, and the wide Mg alloy strip was rarely studied.