To address the corpus collection, the corpus collection system based on semantic relevancy focused crawler is implemented. Word vector trained by Wikipedia and HowNet are used for calculating page information semantic relevancy with descriptive information according to topical keywords, and the URL structural information is used for calculating the topical relevancy. Experimental results show that this system has better effect on party-construction corpus collection with high precision of average accurate rate 94.87%, while the average accurate rate for web pages is 64.20%.