Abstract: The jokes on net are a kind of short and highly summarized form of texts. They are an important tool of utterance hilarity, expression of public opinion and marketing. They play a role of adding fuel to the fire in the hot events on net. From a rhetoric perspective, we can find, for the guidance of development of and innovation in writing paradigms of such jokes, it is of high value and great significance to analyze their rhetoric techniques and effects and expression of public opinions, and explore their rule of writing.