Technology promotes the continuous progress of the times, consumers have more requirements for the characteristics of smart phones and pay more attention to the brand image of smart phones. Various factors affect their willingness to buy. This research analyzed 369 valid questionnaires, and the results of the analysis found that: 1. Product characteristics have a significant positive impact on purchase expectations; 2. Product characteristics have a significant positive effect on Internet word of mouth; 3. Internet word of mouth has a significant positive effect on purchase intention; 4.The brand image has a significant positive impact on purchase expectations; 5. There is an intermediary effect between product characteristics and purchase intentions, and there is an intermediary effect on Internet word-of-mouth; 6.there is no interference between brand image and purchase intentions effect.