Using the summer DSD data observed in Nanjing by Parsivel laser precipitation particle spectrometer, the microphysical features, DSD parameters〖WTBX〗 μλ〖WTBZ〗 relationship, radar parameters 〖WTBX〗ZR〖WTBZ〗 relationship of rain intensities of four levels (light, moderate, heavy, very heavy) are analyzed. Results show that (1) the variation of the average drop diameter is small between different intensity levels, but with the increasing intensity level, the particle concentration, liquid water content, and kinetic energy contents increases; (2) Gamma drop size distribution may be greater than the number of 〖WTBX〗D〖WTBZ〗<0.625 mm〖WTBX〗 〖WTBZ〗particles at the light level and less than the number of 〖WTBX〗D<〖WTBZ〗1 mm particles at the very heavy level. Every intensity level has a good binomial function relationship between〖WTBX〗 μ 〖WTBZ〗and 〖WTBX〗λ〖WTBZ〗. The fitted curves of the lightlevel samples and all samples are close, and the fitted curves of moderate and heavy levels are close to 〖WTBX〗R〖WTBZ〗>5 mm/h samples, and the very heavy rain has higher fitted curves than 〖WTBX〗R〖WTBZ〗>5 mm/h samples. As for whole summer rain, there exists a consistent 〖WTBX〗ZR〖WTBZ〗 relationship, but the 〖WTBX〗ZR〖WTBZ〗 relationship of all samples may lead to the overestimated rain intensity for very heavy precipitation.