Engineering cost has been a major issue in private vocational schools leading to problems like: lack of students learning initiative like a low self-learning ability, poor habit of preview before lesson, low attendance rate, short classroom listening time, low initiative to review after lesson, insufficient investment in practical training room, unreasonable teaching structure, high teacher mobility and inadequate teaching staff. The engineering cost practical training lesson adopts blending teaching construction and always penetrates the civic political elements. The teaching mode is online before the lesson, online and offline blending teaching mode during the lesson, and online teaching mode after the lesson. Blending teaching is great for improving the learning initiative and conscientiousness of private senior vocational students, alleviating the problem of insufficient investment in the training room of private senior vocational engineering costing major, alleviating the problem of unreasonable teacher structure, high teacher mobility and teacher shortage in private senior vocational engineering costing major.