Abstract: The advantage of cloud classroom is no limitations of time and space  and is convenient for statistical analysis of learning situation, but it         lacks onsite interaction . This requires teachers to use a new online interactive method    to track  students learning progress and focus, improve classroom control and the learning effect. Based on the two-factor theory and the Aronson effect, this paper  takes the sophomores of our college as samples, adopts the quasi-natural experiment method,    explores the classroom incentive method and the multiplier method to analyze the cloud classroom learning data empirically. Results proved significant    positive effects of incentive policies  . The number of website visits  reaches the peak of 1 251 in a day. Total number of discussions increases by 1167%. Under the control of other factors, each additional amount of policy incentive will increase 32 amount of comprehensive policy benefits.

Key words: cloud classroom, multiplier method,  incentive theory