打开apache-jmeter-5.3\bin\jmeter.properties文件，搜索“encoding”关键字，找到如下配置：
#The encoding to be used if none is provided (default ISO-8859-1)
#sampleresult.default.encoding=ISO-8859-1
将注释删掉，并改成utf-8编码，即：
The encoding to be used if none is provided (default utf-8)
sampleresult.default.encoding=utf-8
重启JMeter即可