Status Quo，Problems and Improvement Measures of Rice Mechanized Transplanting in Tianjin City

Rice mechanized transplanting developed rapidly since 2009，area of mechanized transplanting showed more than 50%.Because of extreme weather（like high temperature，low temperature，high wind，etc.），simple and crude mode of mechanized transplanting，disperse seedling place，low control level，high salinity in water，and so on，phenomenon like bad seedling and transplanting seedling death happened extensively.There are some suggestions which of promoting factory seedling，improving seedling technique，and improving rice field water quality for ensuring rice mechanized transplanting production.