Bantul Regency is one of regencies in the province of Yogyakarta, which employs organic rice farming system through GO Organic development. But to go to pure organic takes a long time so until now still called semi organic rice. The purpose of this research is that, (1) Analyzing the factors affecting the production of semi-organic and non-organic rice farming in Bantul Regency, (2) analyzing the level of technical efficiency of rice farming semi-organic and non-organic in Bantul Regency. Sampling was carried out using the nonproportional stratified random sampling technique with a sample number of 100 farmers consisting of 50 semi-organic rice farmers and 50 non-organic rice farmers. Data was analyzed using the Cobb-Douglas Stochastic Frontier model production function. The results showed that the variable manure, Phonska fertilizer and TKLK have a real effect on the production of semi-organic rice, while for variable land area, TKDK and TKLK have a real impact on non-organic rice production. Technically, semi-organic rice farmers have been efficient with an average index of technical efficiency of 0.893 and non-organic rice farmers have not been efficiently due to the average index efficiency of its technicalities 0.692. Internal factor of the farmer in the form of age, experience, level of education and dummy land status does not affect the technical inefficiencies of the semi-organic farming, while the age factor and dummy land status is a real effect on technical inefficiencies Non-organic rice farming