Objective Based upon the perspective of Universal Health Coverage (UHC), a mathematical model was developed to measure the development status of Basic Medical Insurance Schemes (BMIS) in China. Methods A mixed model was developed to analyze the BMIS in the period of 2003-2015 from five dimensions: coverage of population, benefit package, reimbursement rate, risk pooling level and unity of the schemes. Sensitivity analysis was also performed. Results The UHC scores for BMIS in China from 2003 to 2015 fluctuated obviously. Given the range of 0-100 percent, The UHC score in 2003 was 52.2% , 28.5% in 2006, 23.9% in 2010 and 26.5% in 2015. The integration and equalization of BMIS and scaling up the risk pooling levels were shown to contribute significantly to UHC. Conclusions A new mathematical mixed model was developed and this is a new contribution as well as the other two models of addition and multiplication to the toolkits to measure UHC. Considering the future development of UHC, there is a still long way to go for BMIS in China. Emphases should be given to integration and equalization of BMIS as well as scaling up the risk polling to provincial and national level