Answer
The script used in Xiao'erjing to write Ma Bufang's name is Xiao'erjing, a modified Arabic script used to write Chinese. It was developed during the Qing dynasty and was widely used by Muslims in China. Xiao'erjing uses a combination of Arabic letters and Chinese characters to represent Chinese sounds and grammar. In the case of Ma Bufang, his name is written as "مَا بُوْ فَانْغ" in Xiao'erjing.