Chinese characters failed to show correctly

[N-damo]

the corresponding R script:
setwd('C:/Users/Lenovo/Desktop')

require( "Nozzle.R1" );
#分析方法
r <- newCustomReport( "My Report" );
s1<- newSection('分析方法')

#########
r<- addTo(r,s1)
writeReport(r,filename = 'reports/my_report',credits = FALSE)
neither html nor browser can correctly show Chinese charater.

my_report.html.txt