Abstract: This is to develop and extend the application of affective computing.Email is one of the most widely used applications on the Net.We design the emotion monitoring system based on Email texts,which is good for harmonious environment of HCI.The sentences in Email come from Commonsence.We chose some sentences from Commonsence.Four structure models are created according to these sentences.At last,we realized emotion monitoring of texts with program language.In the procedure of system implementation,we mark the contextual emotions with colors.This method is one novelty of the paper.