Objective: The research is helpful to improve the scientificity and robustness of the provincial pooling of medical insurance for employees, and provide logical path, empirical data and policy reference for the medical insurance management department to solve the problem of calculating the benefits of the provincial pooling. Methods: The insurance cost sub-model of the ILO model is used to calculate the funding standard of provincial-level coordination in Guizhou Province with 6.20% as the benchmark. According to estimation principle of "balance of income and expenditure", the coefficient of equilibrium method is used to analyze the scheme of employee medical insurance adaptability for the provincial coordination model of unified collection and support. Results: The funding level of 6.20% calculated as the base of medical expenses in 2020 is used for coordination, the lower limit of policy options is 80.00% for inpatient reimbursement and 50.00% for outpatient reimbursement, and the upper limit is 82.00% for inpatient reimbursement and 55.00% for outpatient reimbursement; the number of options is 8; the funding level of 6.60% of the average value of unit contribution in each coordination area is used for coordination, the lower limit of policy options is 80.00% for inpatient. The lower limit of policy options is 80.00% for inpatient reimbursement and 55.00% for outpatient reimbursement, and the upper limit is increased to 85.00% for inpatient reimbursement and 58.00% for outpatient reimbursement. Conclusion: The equilibrium coefficient method in the rough estimation method is appropriate to be applied to the selection of provincial level of benefits. It can provide a detailed and reliable theoretical basis and policy reference for the medical insurance management department to formulate the provincial-level coordinated treatment plan for employees' medical insurance.