Abstract: Quality target of paddy stored under different temperatures and humidity were studied，such as fatty acids value，water，reducing sugar，non-reducing sugar and viscosity.By comparing various indicators of mutual relations and quality of stored paddy，optimum conditions for paddy storage were explored，which could guarantee rice quality.Results showed that，fat acid value was sensitive to environmental condition influence.The time was longer，the fat acid value variation rate would be quicker in the environment with high-temperature and high-humidity.Changes would be slowly in the low temperature and damp environment.With the preserve time expanded and difference storage conditions，changes of reduced sugar value in paddy was not very great.Moreover，content of non-reducing sugar of paddy would gradually decreased in environment with high-temperature and high-humidity.Finally，viscosity of paddy would be showing a downward trend when stored longer，especially in the environment with high-temperature and high-humidity.The fresh paddy′s viscosity was higher，and when temperature and humidity were higher，the viscosity level drop quicker.