Abstract: This paper is based on a research study at Rajendra Agricultural University, Pusa, Bihar. The title of the research was “Mushroom training programme of R.A.U. – a critical analysis of Samastipur district”. It was conducted by taking the responses from sixty respondents included 30 beneficiaries and 30 non-beneficiaries through personal interview. The all sixty respondents were from Thahara and Morsand panchayats of PUSA block. The objective of the study was to assess the extent of recommended mushroom production technology in Samastipur district. The statistical tools like mean, frequency, percentage, standard deviation and t- test were used for data analysis. The analysis revealed that adoption level of beneficiaries was found to be higher than non- beneficiaries and this was statistically significant. Hence, mushroom training had been successful and had significant impact on mushroom growers. Therefore, training programme needs to be given to large number of respondents in order to enhance adoption and diffusion of innovation.