Based on the monthly data of life insurance premium amount of China during 2005—2010, this paper constructs an ARIMA model to forecast the expected amounts of life insurance premium in 2011, compares the expected value with the real value in 2011, measures the deviation between the real premium amount in each month and its theoretical value, uses seasonal adjustment indices to calculate the reduction degree of life insurance premium amount in 2011, and finds that life insurance premium amount declines 11 percent in 2011 by comparing with its theoretical value because of “New Bancassurance Regulation”, among which life insurance premium amount of foreign capital decreased 32 percent by comparing with its theoretical value while the life insurance premium amount of domestic capital decreased 10 percent by comparing with its theoretical value. 