By using CMA-STI best track data, reanalysis data of GFS with horizontal resolution of 0.5°×0.5°, and TBB of satellite FY-2E, the mechanisms of heavy rain occurred in the Jianghan Plain during 23 to 24, 2013 were analyzed. Results show that, North south oriented inverted trough at 850 hPa of tropical depression Trami stays over Jianghan Plain.Yichang city locates at the west side of Jianghan Plain and Wuhan city at the east side of the plain, and low level warm advection developed at both Yichang and Wuhan radio-sonde stations, but high level cold advection just developed at Wuhan station in the evening of 23 August 2013. Two α-scale convective clouds influence the Jianghan Plain successively in the evening of 23 August 2013. There are less short duration heavy rain stations and the averaged rain amount. Cold air moves southward at the lower reaches of the Yellow River in the evening of 24 August, and the inverted trough at 850 hPa stays over the Jianghan Plain and rotates clockwise to stretch from southwest to northeast. Equivalent potential temperature front strengthens at 925 hPa over the adjacent area of Henan and Hubei Provinces. Low level warm advection and high level cold advection develop at both Wuhan and Yichang radio-sonde stations. Both static instability and precipitable water vapor at Yichang station enlarge, meanwhile they maintain high values over Wuhan station, and vertical shear values of horizontal wind over two stations reduce, which are advantageous to development of wet convection over the Jianghan Plain. And only one α-scale convective cloud forms after many times of β-scale convective cloud combinations, and there are more short duration heavy rain stations and the averaged rain. The short duration heavy rain area is closer to the inverted trough at 850 hPa. Motivated by Coriolis item of geo-strophic deviation of u wind, south wind replaced north wind over southwest of Hubei at 850 hPa after 20 of 24 August 2013, thus the inverted trough moved westward out of Hubei. But advection and convection items of v wind were not favorable all the time, which are the main reasons why inverted trough stayed over the Jianghan Plain.