New quantitative analysis method of second phase in composite material was developed using Rietveld and WIMV method to correct texture effect of specimen. To verify proposed method a reference specimen which consists of SUS 304(austensit-60 vol%) and SUS 420(martensite-40 vol%) was used. The measured volume fraction of martenstie with neutron and X-ray were in good agreement with that of reference specimen. The volume fraction of martensite of uniaxialy tensioned SUS 304 for engineering strain 50% and the volume fraction of austenite in hot rolled TRIP steel were measured by neutron and X-ray. The measured volume fractions with X-ray were in good agreement with those with neutron.