Taking the typhoon "Choi-wan" on the 14th of 2009 as an example, based on CloudSat related cloud products, the effective particle radius and cloud water content distribution characteristics of water and ice clouds in the deep convection cloud of the typhoon were calculated. On this basis, the correlation between the two cloud microphysical parameters was discussed, and the application test of this relationship was performed for multiple typhoons in different development periods. The results show that, for both water clouds and ice clouds, if the water content of clouds is taken as the x-coordinate and the effective particle radius of clouds as the y-coordinate, the distribution of scatter map of the typhoon deep convective cloud pixel has an obvious lower boundary. The boundary value gradually increases with the increase of effective particle radius and cloud water content parameters. The effective particle radius of low-level water clouds below the zero layer has a positive correlation with the liquid water content, which can be fitted using a logarithmic relationship. The test shows that the fitting relationship is also applicable to typhoons in other stages of development, confirming the universality of the relationship.