Honge oil methyl ester (HOME) with B-20 blend is considered to examine thermal con- ductivity and thermal degredation of the biodiesel. Transient hot wire method is adopted to determine thermal conductivity of the samples.Heat source is clubbed with C-DAQ and LAB-VIEW software is utilized to record temperature and time. Following Sastry’s power law model, an improved emperical relation is developed for thermal conductivity of HOME with B-20 blend. Thermogravitometry (TG-DTG) analysis is performed under atmospheric condi- tions with 10°C/min heating rate of pure air flow.Diesel is exhibited one mass loss event from 55–334°C, whereas two mass loss event in case of biodiesel. Maximum decoposition tem- perature noticed for diesel,HOME andB-20 blend are 195°C, 227°C and 175°C respectively. Complete mass degradation takes place for diesel and HOME at 498°C, in case of HOME with B-20 blend complete mass degradation occurred at 377°C.