The fluxes of CH₄ emission from rice fields were measured by the method of static chamber in Changchun area in 3 consecutive years.The research results show that the mean flux of CH₄ emission was 2.984mg/(m²·h) and the total amount of CH₄ emission was 0.0203 Tg/a from the rice fields in Changchun area.Estimation of methane emission is a new application field of remote sensing.The estimating method of rice methane emission is as follows:1) TM and NOAA AVHRR data are used to measure rice area and to predict its change tendency; 2) rice NDVI values are got during various rice growth phases based on remote sensing of rice condition of growth; 3) the optimum correlation factor is elected according to gray system theory; 4) empirical formula between rice NDVI and CH₄ fluxes of rice field is set up; 5) rice methane emission is estimated by rice area and NDVI.The method is used to estimate methane emission of rice field for the first time in Changchun area in 1996 and 1997.The results are acceptable after examination.