The issue of agricultural insurance subsidy is discussed in this paper aiming to make it provided more rationally and sci- entifically. It is started with the connection between agricultural insurance and financial subsidy. It is really necessary and crucial to implement the financial insurance due to the bad operational performance, especially in the developing countries. But the sub- sidy should be provided more rationally because financial subsidy has lots of negative effects. A model in competitive insurance markets developed by Ahsan et al (1982) and a farmers’ decision model are developed to solve the optimal subsidized rate. Finally, the equation is got to calculate it. But a quantitative subsidized rate is not made here because the calculation should be under some restricted conditions, which are always absent in the devel- oping countries. So the government should provide some subsidy for the ex ante research and preparation to get the scientific prob- ability and premium rate. The issue of agricultural insurance subsidy is discussed in this paper aiming to make it provided more rationally and sci- entifically. It is started with the connection between agricultural insurance and financial subsidy. It is really necessary and crucial to implement the financial insurance due to the bad operational performance, especially in the developing countries. But the sub- sidy should be provided more rationally because financial subsidy has lots of negative effects. A model in competitive insurance markets developed by Ahsan et al (1982) and a farmers’ decision model are developed to solve the optimal subsidized rate. Finally, the equation is got to calculate it. But a quantitative subsidized rate is not made here because the calculation should be under restricted conditions, which are always absent in the devel- oping countries. So the government should provide some subsidy for the ex ante research and preparation to get the scientific prob- ability and premium rate .